-
Hence model assessments consider: • whether the data contain reasonable measurements of appropriate variables, • whether the modeled case are causally homogeneous, (It makes
no sense to estimate one model if the data cases reflect two or more different causal networks.) -
Because a postulated model such as Figure 1 may not correspond to the worldly forces controlling the observed data measurements, the programs also provide model tests and
diagnostic clues suggesting which indicators, or which model components, might introduce inconsistency between the model and observed data. -
[4] The boundary between what is and is not a structural equation model is not always clear but SE models often contain postulated causal connections among a set of latent
variables (variables thought to exist but which can’t be directly observed, like an attitude, intelligence or mental illness) and causal connections linking the postulated latent variables to variables that can be observed and whose values
are available in some data set. -
Fitting yet worldly-inconsistent models are especially likely to arise if a researcher committed to a particular model (for example a factor model having a desired number
of factors) gets an initially-failing model to fit by inserting measurement error covariances “suggested” by modification indices. -
The model’s implications for what the data should look like for a specific set of coefficient values depends on: a) the coefficients’ locations in the model (e.g.
-
Model specification[edit] Building or specifying a model requires attending to: • the set of variables to be employed, • what is known about the variables, • what is presumed
or hypothesized about the variables’ causal connections and disconnections, • what the researcher seeks to learn from the modeling, • and the cases for which values of the variables will be available (kids? -
A small χ2 probability reports it would be unlikely for the current data to have arisen if the current model structure constituted the real population causal forces – with
the remaining differences attributed to random sampling variations. -
This makes it possible to use the connections between the observed variables’ values to estimate the magnitudes of the postulated effects, and to test whether or not the observed
data are consistent with the requirements of the hypothesized causal structures. -
A modification index is an estimate of how much a model’s fit to the data would “improve” (but not necessarily how much the model’s structure would improve) if a specific
currently-fixed model coefficient were freed for estimation. -
Ordinary least squares estimates are the coefficient values that minimize the squared differences between the data and what the data would look like if the model was correctly
specified, namely if all the model’s estimated features correspond to real worldly features. -
A small χ2 probability reports it would be unlikely for the current data to have arisen if the modeled structure constituted the real population causal forces – with the remaining
differences attributed to random sampling variations. -
The output from SEM programs includes a matrix reporting the relationships among the observed variables that would be observed if the estimated model effects actually controlled
the observed variables’ values. -
[5][6][7][8][9] SEM researchers use computer programs to estimate the strength and sign of the coefficients corresponding to the modeled structural connections, for example
the numbers connected to the arrows in Figure 1. -
Numerous fit indices quantify how closely a model fits the data but all fit indices suffer from the logical difficulty that the size or amount of ill fit is not trustably
coordinated with the severity or nature of the issues producing the data inconsistency. -
Estimated values for free model coefficients are obtained by maximizing fit to, or minimizing difference from, the data relative to what the data’s features would be if the
free model coefficients took on the estimated values. -
“[31] Model misspecification may sometimes be corrected by insertion of coefficients suggested by the modification indices, but many more corrective possibilities are raised
by employing a few indicators of similar-yet-importantly-different latent variables. -
The probability accompanying a χ2 (chi-squared) test is the probability that the data could arise by random sampling variations if the estimated model constituted the real
underlying population forces. -
If a model remains inconsistent with the data despite selecting optimal coefficient estimates, an honest research response reports and attends to this evidence (often a significant
model χ2 test). -
For example, the magnitude of a single data correlation between two variables is insufficient to provide estimates of a reciprocal pair of modeled effects between those variables.
-
[33] The probability accompanying a χ2 test is the probability that the data could arise by random sampling variations if the current model, with its optimal estimates, constituted
the real underlying population forces. -
[10] A great advantage of SEM is that all of these measurements and tests occur simultaneously in one statistical estimation procedure, where all the model coefficient are
calculated using all information from the observed variables. -
Researchers confronting data-inconsistent models can easily free coefficients the modification indices report as likely to produce substantial improvements in fit.
-
[27] Such models are data-fit-equivalent though not causally equivalent, so at least one of the so-called equivalent models must be inconsistent with the world’s structure.
-
The factor-structured portion of the model incorporated measurement errors which permitted measurement-error-adjustment, though not necessarily error-free estimation, of effects
connecting different postulated latent variables. -
[27] One common problem is that a coefficient’s estimated value may be underidentified because it is insufficiently constrained by the model and data.
-
[32] The considerations relevant to using fit indices include checking: 1. whether data concerns have been addressed (to ensure data mistakes are not driving model-data inconsistency);
2. whether criterion values for the index have been investigated for models structured like the researcher’s model (e.g. -
(The estimation process minimizes the differences between the model and data but important and informative differences may remain.)
-
which variables are connected/disconnected), b) the nature of the connections between the variables (covariances or effects; with effects often assumed to be linear), c) the
nature of the error or residual variables (often assumed to be independent of, or causally-disconnected from, many variables), and d) the measurement scales appropriate for the variables (interval level measurement is often assumed). -
With maximum likelihood estimation, the numerical values of all the free model coefficients are individually adjusted (progressively increased or decreased from initial start
values) until they maximize the likelihood of observing the sample data – whether the data are the variables’ covariances/correlations, or the cases’ actual values on the indicator variables. -
The original model may contain causal misspecifications such as incorrectly directed effects, or incorrect assumptions about unavailable variables, and such problems cannot
be corrected by adding coefficients to the current model. -
[25] SEM analyses are popular in the social sciences because computer programs make it possible to estimate complicated causal structures, but the complexity of the models
introduces substantial variability in the quality of the results. -
index criterion based on factor structured models are only appropriate if the researcher’s model actually is factor structured); 3. whether the kinds of potential misspecifications
in the current model correspond to the kinds of misspecifications on which the index criterion are based (e.g. -
The frictions created by disagreements over the necessity of correcting model misspecifications will likely increase with increasing use of non-factor-structured models, and
with use of fewer, more-precise, indicators of similar yet importantly-different latent variables. -
criteria based on simulation of omitted factor loadings may not be appropriate for misspecification resulting from failure to include appropriate control variables); 4. whether
the researcher knowingly agrees to disregard evidence pointing to the kinds of misspecifications on which the index criteria were based. -
[20][21] Viewing factor analysis as a data-reduction technique deemphasizes testing, which contrasts with path analytic appreciation for testing postulated causal connections
– where the test result might signal model misspecification. -
The appropriate statistical feature to maximize or minimize to obtain estimates depends on the variables’ levels of measurement (estimation is generally easier with interval
level measurements than with nominal or ordinal measures), and where a specific variable appears in the model (e.g. -
Underidentified effect estimates can be rendered identified by introducing additional model and/or data constraints.
-
Coefficient estimates in data-inconsistent (“failing”) models are interpretable, as reports of how the world would appear to someone believing a model that conflicts with
the available data. -
If the replicate data is within random variations of the original data, the same incorrect coefficient placements that provided inappropriate-fit to the original data will
likely also inappropriately-fit the replicate data. -
For example, reciprocal effects can be rendered identified by constraining one effect estimate to be double, triple, or equivalent to, the other effect estimate,[29] but the
resultant estimates will only be trustworthy if the additional model constraint corresponds to the world’s structure. -
Some of the more commonly used fit statistics include • Chi-square o A fundamental test of fit used in the calculation of many other fit measures.
-
[35] Many researchers tried to justify switching to fit-indices, rather than testing their models, by claiming that χ2 increases (and hence χ2 probability decreases) with
increasing sample size (N). -
[11] History Structural equation modeling (SEM) began differentiating itself from correlation and regression when Sewall Wright provided explicit causal interpretations for
a set of regression-style equations based on a solid understanding of the physical and physiological mechanisms producing direct and indirect effects among his observed variables. -
This logical weakness renders all fit indices “unhelpful” whenever a structural equation model is significantly inconsistent with the data,[36] but several forces continue
to propagate fit-index use. -
Browne, McCallum, Kim, Andersen, and Glaser presented a factor model they viewed as acceptable despite the model being significantly inconsistent with their data according
to χ2. -
The model may include intervening variables – variables receiving effects from some variables but also sending effects to other variables.
-
This simultaneously introduces a substantial risk of moving from a causally-wrong-and-failing model to a causally-wrong-but-fitting model because improved data-fit does not
provide assurance that the freed coefficients are substantively reasonable or world matching. -
Statistically possible estimates that are inconsistent with theory may also challenge theory, and our understanding.)
-
• whether the model appropriately represents the theory or features of interest, (Models are unpersuasive if they omit features required by a theory, or contain coefficients
inconsistent with that theory.) -
Structural equation models often contain postulated causal connections among some latent variables (variables thought to exist but which can’t be directly observed).
-
-
Some, but not all, results are obtained without the “inconvenience” of understanding experimental design, statistical control, the consequences of sample size, and other features
contributing to good research design. -
Additional causal connections link those latent variables to observed variables whose values appear in a data set.
-
if the model is significantly data-inconsistent, the “tolerable” amount of inconsistency is likely to differ in the context of medical, business, social and psychological
contexts.). -
SEM programs provide estimates and tests of the free coefficients, while the fixed coefficients contribute importantly to testing the overall model structure.
-
Replication helps detect issues such as data mistakes (made by different research groups), but is especially weak at detecting misspecifications after exploratory model modification
– as when confirmatory factor analysis (CFA) is applied to a random second-half of data following exploratory factor analysis (EFA) of first-half data. -
One of several programs Karl Jöreskog developed at Educational Testing Services, LISREL[17][18][19] embedded latent variables (which psychologists knew as the latent factors
from factor analysis) within path-analysis-style equations (which sociologists inherited from Wright and Duncan). -
A Type III error arises from “accepting” a model hypothesis when the current data are sufficient to reject the model.
-
Theoretical demands for null/zero effects provide helpful constraints assisting estimation, though theories often fail to clearly report which effects are allegedly nonexistent.
-
The estimates may even closely match a theory’s requirements but the remaining data inconsistency renders the match between the estimates and theory unable to provide succor.
-
A cautionary instance was provided by Browne, MacCallum, Kim, Anderson, and Glaser who addressed the mathematics behind why the χ2 test can have (though it does not always
have) considerable power to detect model misspecification. -
Wright’s path analysis influenced Hermann Wold, Wold’s student Karl Jöreskog, and Jöreskog’s student Claes Fornell, but SEM never gained a large following among U.S. econometricians,
possibly due to fundamental differences in modeling objectives and typical data structures. -
Criticisms of SEM methods hint at: disregard of available model tests, problems in the model’s specification, a tendency to accept models without considering external validity,
and potential philosophical biases. -
[27][6][16] The model specification depends on what is known from the literature, the researcher’s experience with the modeled indicator variables, and the features being
investigated by using the specific model structure. -
[28] Notice that this again presumes the properness of the model’s causal specification – namely that there really is a direct effect leading from the third variable to the
variable at this end of the reciprocal effects and no direct effect on the variable at the “other end” of the reciprocally connected pair of variables.
Works Cited
[‘Salkind, Neil J. (2007). “Intelligence Tests”. Encyclopedia of Measurement and Statistics. doi:10.4135/9781412952644.n220. ISBN 978-1-4129-1611-0.
1. ^ Boslaugh, S.; McNutt, L-A. (2008). “Structural Equation Modeling”. Encyclopedia of Epidemiology.
doi 10.4135/9781412953948.n443, ISBN 978-1-4129-2816-8.
2. ^ Shelley, M. C. (2006). “Structural Equation Modeling”. Encyclopedia of Educational Leadership and Administration. doi 10.4135/9781412939584.n544, ISBN 978-0-7619-3087-7.
3. ^ Jump up
to:a b c d e Pearl, J. (2009). Causality: Models, Reasoning, and Inference. Second edition. New York: Cambridge University Press.
4. ^ Kline, Rex B. (2016). Principles and practice of structural equation modeling (4th ed.). New York. ISBN 978-1-4625-2334-4.
OCLC 934184322.
5. ^ Jump up to:a b c d e f Hayduk, L. (1987) Structural Equation Modeling with LISREL: Essentials and Advances. Baltimore, Johns Hopkins University Press. ISBN 0-8018-3478-3
6. ^ Bollen, Kenneth A. (1989). Structural equations
with latent variables. New York: Wiley. ISBN 0-471-01171-1. OCLC 18834634.
7. ^ Kaplan, David (2009). Structural equation modeling: foundations and extensions (2nd ed.). Los Angeles: SAGE. ISBN 978-1-4129-1624-0. OCLC 225852466.
8. ^ Curran, Patrick
J. (2003-10-01). “Have Multilevel Models Been Structural Equation Models All Along?”. Multivariate Behavioral Research. 38 (4): 529–569. doi:10.1207/s15327906mbr3804_5. ISSN 0027-3171. PMID 26777445. S2CID 7384127.
9. ^ Tarka, Piotr (2017). “An
overview of structural equation modeling: Its beginnings, historical development, usefulness and controversies in the social sciences”. Quality & Quantity. 52 (1): 313–54. doi:10.1007/s11135-017-0469-8. PMC 5794813. PMID 29416184.
10. ^ MacCallum
& Austin 2000, p. 209.
11. ^ Wright, Sewall. (1921) “Correlation and causation”. Journal of Agricultural Research. 20: 557-585.
12. ^ Wright, Sewall. (1934) “The method of path coefficients”. The Annals of Mathematical Statistics. 5 (3): 161-215.
doi: 10.1214/aoms/1177732676.
13. ^ Wolfle, L.M. (1999) “Sewall Wright on the method of path coefficients: An annotated bibliography” Structural Equation Modeling: 6(3):280-291.
14. ^ Jump up to:a b c d Duncan, Otis Dudley. (1975). Introduction
to Structural Equation Models. New York: Academic Press. ISBN 0-12-224150-9.
15. ^ Jump up to:a b c d Bollen, K. (1989). Structural Equations with Latent Variables. New York, Wiley. ISBN 0-471-01171-1.
16. ^ Jöreskog, Karl; Gruvaeus, Gunnar T.;
van Thillo, Marielle. (1970) ACOVS: A General Computer Program for Analysis of Covariance Structures. Princeton, N.J.; Educational Testing Services.
17. ^ Jöreskog, Karl Gustav; van Thillo, Mariella (1972). “LISREL: A General Computer Program for
Estimating a Linear Structural Equation System Involving Multiple Indicators of Unmeasured Variables” (PDF). Research Bulletin: Office of Education. ETS-RB-72-56 – via US Government.
18. ^ Jump up to:a b Jöreskog, Karl; Sorbom, Dag. (1976) LISREL
III: Estimation of Linear Structural Equation Systems by Maximum Likelihood Methods. Chicago: National Educational Resources, Inc.
19. ^ Jump up to:a b Hayduk, L.; Glaser, D.N. (2000) “Jiving the Four-Step, Waltzing Around Factor Analysis, and Other
Serious Fun”. Structural Equation Modeling. 7 (1): 1-35.
20. ^ Jump up to:a b Hayduk, L.; Glaser, D.N. (2000) “Doing the Four-Step, Right-2-3, Wrong-2-3: A Brief Reply to Mulaik and Millsap; Bollen; Bentler; and Herting and Costner”. Structural
Equation Modeling. 7 (1): 111-123.
21. ^ Westland, J.C. (2015). Structural Equation Modeling: From Paths to Networks. New York, Springer.
22. ^ Christ, Carl F. (1994). “The Cowles Commission’s Contributions to Econometrics at Chicago, 1939-1955”.
Journal of Economic Literature. 32 (1): 30–59. ISSN 0022-0515. JSTOR 2728422.
23. ^ Imbens, G.W. (2020). “Potential outcome and directed acyclic graph approaches to causality: Relevance for empirical practice in economics”. Journal of Economic Literature.
58 (4): 11-20-1179.
24. ^ Jump up to:a b c Bollen, K.A.; Pearl, J. (2013) “Eight myths about causality and structural equation models.” In S.L. Morgan (ed.) Handbook of Causal Analysis for Social Research, Chapter 15, 301-328, Springer. doi:10.1007/978-94-007-6094-3_15
25. ^
Jump up to:a b Borsboom, D.; Mellenbergh, G. J.; van Heerden, J. (2003). “The theoretical status of latent variables.” Psychological Review, 110 (2): 203–219. https://doi.org/10.1037/0033-295X.110.2.203 }
26. ^ Jump up to:a b c d e f g h i Kline,
Rex. (2016) Principles and Practice of Structural Equation Modeling (4th ed). New York, Guilford Press. ISBN 978-1-4625-2334-4
27. ^ Jump up to:a b c Rigdon, E. (1995). “A necessary and sufficient identification rule for structural models estimated
in practice.” Multivariate Behavioral Research. 30 (3): 359-383.
28. ^ Jump up to:a b c d e f g Hayduk, L. (1996) LISREL Issues, Debates, and Strategies. Baltimore, Johns Hopkins University Press. ISBN 0-8018-5336-2
29. ^ Jump up to:a b c d e
f Hayduk, L.A. (2014b) “Shame for disrespecting evidence: The personal consequences of insufficient respect for structural equation model testing. BMC: Medical Research Methodology, 14 (124): 1-10 DOI 10.1186/1471-2288-14-24 http://www.biomedcentral.com/1471-2288/14/124
30. ^
MacCallum, Robert (1986). “Specification searches in covariance structure modeling”. Psychological Bulletin. 100: 107–120. doi:10.1037/0033-2909.100.1.107.
31. ^ Jump up to:a b c d Hayduk, L. A.; Littvay, L. (2012) “Should researchers use single
indicators, best indicators, or multiple indicators in structural equation models?” BMC Medical Research Methodology, 12 (159): 1-17. doi: 10,1186/1471-2288-12-159
32. ^ Browne, M.W.; MacCallum, R.C.; Kim, C.T.; Andersen, B.L.; Glaser, R. (2002)
“When fit indices and residuals are incompatible.” Psychological Methods. 7: 403-421.
33. ^ Jump up to:a b Hayduk, L. A.; Pazderka-Robinson, H.; Cummings, G.G.; Levers, M-J. D.; Beres, M. A. (2005) “Structural equation model testing and the quality
of natural killer cell activity measurements.” BMC Medical Research Methodology. 5 (1): 1-9. doi: 10.1186/1471-2288-5-1. Note the correction of .922 to .992, and the correction of .944 to .994 in the Hayduk, et al. Table 1.
34. ^ Jump up to:a b
c Hayduk, L.A. (2014a) “Seeing perfectly-fitting factor models that are causally misspecified: Understanding that close-fitting models can be worse.” Educational and Psychological Measurement. 74 (6): 905-926. doi: 10.1177/0013164414527449
35. ^
Jump up to:a b c d e f g Barrett, P. (2007). “Structural equation modeling: Adjudging model fit.” Personality and Individual Differences. 42 (5): 815-824.
36. ^ Satorra, A.; and Bentler, P. M. (1994) “Corrections to test statistics and standard
errors in covariance structure analysis”. In A. von Eye and C. C. Clogg (Eds.), Latent variables analysis: Applications for developmental research (pp. 399-419). Thousand Oaks, CA: Sage.
37. ^ Sorbom, D. “xxxxx” in Cudeck, R; du Toit R.; Sorbom,
D. (editors) (2001) Structural Equation Modeling: Present and Future: Festschrift in Honor of Karl Joreskog. Scientific Software International: Lincolnwood, IL.
38. ^ Jump up to:a b c d e f g h Hu, L.; Bentler, P.M. (1999) “Cutoff criteria for fit
indices in covariance structure analysis: Conventional criteria versus new alternatives.” Structural Equation Modeling. 6: 1-55.
39. ^ Kline 2011, p. 205.
40. ^ Kline 2011, p. 206.
41. ^ Jump up to:a b Hu & Bentler 1999, p. 27.
42. ^ Steiger,
J. H.; and Lind, J. (1980) “Statistically Based Tests for the Number of Common Factors.” Paper presented at the annual meeting of the Psychometric Society, Iowa City.
43. ^ Steiger, J. H. (1990) “Structural Model Evaluation and Modification: An
Interval Estimation Approach”. Multivariate Behavioral Research 25:173-180.
44. ^ Browne, M.W.; Cudeck, R. (1992) “Alternate ways of assessing model fit.” Sociological Methods and Research. 21(2): 230-258.
45. ^ Herting, R.H.; Costner, H.L. (2000)
“Another perspective on “The proper number of factors” and the appropriate number of steps.” Structural Equation Modeling. 7 (1): 92-110.
46. ^ Hayduk, L. (1987) Structural Equation Modeling with LISREL: Essentials and Advances, page 20. Baltimore,
Johns Hopkins University Press. ISBN 0-8018-3478-3 Page 20
47. ^ Hayduk, L. A.; Cummings, G.; Stratkotter, R.; Nimmo, M.; Grugoryev, K.; Dosman, D.; Gillespie, M.; Pazderka-Robinson, H. (2003) “Pearl’s D-separation: One more step into causal thinking.”
Structural Equation Modeling. 10 (2): 289-311.
48. ^ Hayduk, L.A. (2006) “Blocked-Error-R2: A conceptually improved definition of the proportion of explained variance in models containing loops or correlated residuals.” Quality and Quantity. 40:
629-649.
49. ^ Jump up to:a b Millsap, R.E. (2007) “Structural equation modeling made difficult.” Personality and Individual Differences. 42: 875-881.
50. ^ Jump up to:a b Entwisle, D.R.; Hayduk, L.A.; Reilly, T.W. (1982) Early Schooling: Cognitive
and Affective Outcomes. Baltimore: Johns Hopkins University Press.
51. ^ Hayduk, L.A. (1994). “Personal space: Understanding the simplex model.” Journal of Nonverbal Behavior., 18 (3): 245-260.
52. ^ Hayduk, L.A.; Stratkotter, R.; Rovers, M.W.
(1997) “Sexual Orientation and the Willingness of Catholic Seminary Students to Conform to Church Teachings.” Journal for the Scientific Study of Religion. 36 (3): 455-467.
53. ^ Jump up to:a b Rigdon, E.E.; Sarstedt, M.; Ringle, M. (2017) “On Comparing
Results from CB-SEM and PLS-SEM: Five Perspectives and Five Recommendations”. Marketing ZFP. 39 (3): 4–16. doi:10.15358/0344-1369-2017-3-4
54. ^ Hayduk, L.A.; Cummings, G.; Boadu, K.; Pazderka-Robinson, H.; Boulianne, S. (2007) “Testing! testing!
one, two, three – Testing the theory in structural equation models!” Personality and Individual Differences. 42 (5): 841-850
55. ^ Mulaik, S.A. (2009) Foundations of Factor Analysis (second edition). Chapman and Hall/CRC. Boca Raton, pages 130-131.
56. ^
Levy, R.; Hancock, G.R. (2007) “A framework of statistical tests for comparing mean and covariance structure models.” Multivariate Behavioral Research. 42(1): 33-66.
57. ^ Hayduk, L.A. (2018) “Review essay on Rex B. Kline’s Principles and Practice
of Structural Equation Modeling: Encouraging a fifth edition.” Canadian Studies in Population. 45 (3-4): 154-178. DOI 10.25336/csp29397
58. ^ Marsh, Herbert W.; Morin, Alexandre J.S.; Parker, Philip D.; Kaur, Gurvinder (2014-03-28). “Exploratory
Structural Equation Modeling: An Integration of the Best Features of Exploratory and Confirmatory Factor Analysis”. Annual Review of Clinical Psychology. 10 (1): 85–110. doi:10.1146/annurev-clinpsy-032813-153700. ISSN 1548-5943. PMID 24313568.
59. ^
Hayduk, L.A.; Estabrooks, C.A.; Hoben, M. (2019). “Fusion validity: Theory-based scale assessment via causal structural equation modeling.” Frontiers in Psychology, 10: 1139. doi: 10.3389/psyg.2019.01139
60. ^ Zyphur, Michael J.; Allison, Paul D.;
Tay, Louis; Voelkle, Manuel C.; Preacher, Kristopher J.; Zhang, Zhen; Hamaker, Ellen L.; Shamsollahi, Ali; Pierides, Dean C.; Koval, Peter; Diener, Ed (October 2020). “From Data to Causes I: Building A General Cross-Lagged Panel Model (GCLM)”. Organizational
Research Methods. 23 (4): 651–687. doi:10.1177/1094428119847278. hdl:11343/247887. ISSN 1094-4281. S2CID 181878548.
61. ^ Leitgöb, Heinz; Seddig, Daniel; Asparouhov, Tihomir; Behr, Dorothée; Davidov, Eldad; De Roover, Kim; Jak, Suzanne; Meitinger,
Katharina; Menold, Natalja; Muthén, Bengt; Rudnev, Maksim; Schmidt, Peter; van de Schoot, Rens (February 2023). “Measurement invariance in the social sciences: Historical development, methodological challenges, state of the art, and future perspectives”.
Social Science Research. 110: 102805. doi:10.1016/j.ssresearch.2022.102805. hdl:1874/431763. PMID 36796989. S2CID 253343751.
62. ^ Sadikaj, Gentiana; Wright, Aidan G.C.; Dunkley, David M.; Zuroff, David C.; Moskowitz, D.S. (2021), “Multilevel structural
equation modeling for intensive longitudinal data: A practical guide for personality researchers”, The Handbook of Personality Dynamics and Processes, Elsevier, pp. 855–885, doi:10.1016/b978-0-12-813995-0.00033-9, ISBN 978-0-12-813995-0, retrieved
2023-11-03
63. ^ Narayanan, A. (2012-05-01). “A Review of Eight Software Packages for Structural Equation Modeling”. The American Statistician. 66 (2): 129–138. doi:10.1080/00031305.2012.708641. ISSN 0003-1305. S2CID 59460771.
Photo credit: https://www.flickr.com/photos/wickenden/3883895985/’]