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Structural equations modeling: Fit Indices, sample size, and advanced topics
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This article is the second of two parts intended to serve as a primer for structural equations models for the behavioral researcher. The first article introduced the basics: the measurement model, the structural model, and the combined, full structural equations model. In this second article, advanced issues are addressed, including fit indices and sample size, moderators, longitudinal data, mediation, and so forth.
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“The results in Figure 1 suggested excellent model fit (Iacobucci 2010: p. 91): χ 2 (32) = 97.994(p=0.000); and χ 2 /df = 3.06.Further, GFI = .968;CFI = .984;RMSEA = .061;and SRMR = .0278;thus corroborating the excellent model fit to the data”
From Consumer Brand Engagement in Social Media: Conceptualization, Scale Development and Validation (2014) · cites this paper as Iacobucci 2010
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“However, given that even trivial deviations from a perfect model are likely to produce a significant χ 2 statistic with large sample sizes (Iacobucci, 2010), the “normed” χ 2 statistic ( χ 2 /df) was also examined.”
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“While the sample size in the current study is relatively small (N = 156), it has been suggested that SEM can be effective with small samples (e.g., 50–100; Iacobucci, 2010).”
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“Therefore, the overall fit of the theoretical model was within an acceptable range (Iacobucci, 2010).”
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“However, by using a robust estimation method, item-parceling, and indicators with adequate psychometric properties, we have followed the current recommendations and can assume that our calculations are not under-powered (Iacobucci, 2010; Kyriazos, 2018).”
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“A nonsignificant chi-square test indicates that the model fits the data well (Iacobucci, 2010).”
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“After assessing model fit among latent variables, results of the structural model indicated the structural model fit the data well (Iacobucci, 2010; see Table 2).”
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“Iacobucci (2010) proffer the sample should not fall short of 200 subjects while using SEM model.”
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“For each model we examined the overall Chi-square (X2, difference between expected and observed covariance matrices, nonsignificance = good fit), comparative fit index (CFI) [43, 45], which assesses goodness-of-fit adjusted for model complexity or parsimony, [0.90 = adequate fit, [0.95 = good fit) [41, 44], Tucker-Lew…”
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“…the model and the data (Hoelter, 1983; Hu & Bentler, 1999), while simultaneously recognizing the cautions put forth by multiple experts of not treating these suggested cutoff values as absolute cut-off rules (Iacobucci, 2010; Marsh, Hau, & Wen, 2004; Schermelleh-Engel, Moosbrugger, & Müller, 2003).”
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“0 software and the maximum likelihood method because the sample size was well over 50 respondents (Iacobucci, 2010).”
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“1984; Iacobucci, 2010). Second, the respondents were all from one country, South Korea, meaning that the results may not be generalizable to other countries. Future studies may explore the differences in practice across different countries. This study attempted to capture a key success factor of crisis management, ide…”
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“92 | Journal of Behavioral Addictions 5(1), pp. 90–99 (2016)”
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“In order to evaluate the model fits, suggestions of Iacobucci (2010) were followed.”
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Navigating from programme loyalty to company loyalty
Gupta, S., Gupta, T., & Shainesh, G. (2018) · IIMB Management Review · doi:10.1016/j.iimb.2018.01.009 · Cited by 19
Cengiz, E., Cengiz, F., Demirçiftçi, T., & Çobanoğlu, C. (2018) · Journal of Foodservice Business Research · doi:10.1080/15378020.2018.1493893 · Cited by 19
“…for the data: χ2/df = 1.985 (p = .159); CFI = 0.996; GFI: 0.990; SRMR = 0.0263; RMSEA = 0.056 (Guzman, Lagdaan, & Lagoy, 2015; Hu & Bentler, 1999; Iacobucci, 2009, 2010; Jarvis, Mackenzie, Podsakoff, Mick, & Bearden, 2003; Kline, 2011; Maslowsky, Jager, & Hemken, 2015; Perry et al., 2015),…”
InfluentialChicote‐López, J., Sos, A. A., Gallardo, L. O., & García‐González, L. (2017) · Journal of Community Psychology · doi:10.1002/jcop.21945 · Cited by 25
“Thus, a fit model is considered adequate when the Comparative Fit Index (CFI) and Tucker-Lewis Index (TLI) have values of >.90, the Root Mean Square Error of Approximation (RMSEA) is .06 and Standardized Root Mean Square Residual (SRMR) .08 (Iacobucci, 2010).”
Methodvan der Merwe, M., Kirsten, J., & Trienekens, J. (2017) · Agricultural Economics · doi:10.1111/agec.12389 · Cited by 19
Beginning Nurses’ Perceptions of Ethical Leadership in the Shadow of Mid Staffs
Mastracci, S. H. (2017) · Public Integrity · doi:10.1080/10999922.2016.1231506 · Cited by 19
“%) and also providing a suitable sample size for structural equation modeling (Iacobucci, 2010).”
BackgroundMartínez, A. D., Ruelas, L., & Granger, D. A. (2016) · Developmental Psychobiology · doi:10.1002/dev.21492 · Cited by 23
“Nonetheless, methodologists (Anderson & Gerbing, 1984; Iacobucci, 2010) suggest a sample size of at least 100 for convergence in a structural equation model, where we had a total of 111 participants.”
BackgroundPelentsov, L. J., Fielder, A., Laws, T., & Esterman, A. (2016) · Journal of Multidisciplinary Healthcare · doi:10.2147/jmdh.s113898 · Cited by 19
“There is no consensus about required sample sizes for both EFA and CFA; however, a minimum sample of 100 has been proposed.(20)”
I complain for your good? Re-examining consumer advocacy
Jayasimha, K., & Billore, A. (2016) · doi:10.1080/0965254x.2015.1011204 · Cited by 19
“To testmoderation using SEM, themean centered consumer advocacy, severity, and their product were introduced as predictors (Iacobucci, 2010).”
MethodCredibility and price premium-based competitiveness for industrial brands
Leckie, C., Dwivedi, A., & Johnson, L. W. (2023) · Journal of Retailing and Consumer Services · doi:10.1016/j.jretconser.2023.103418 · Cited by 24
The Effect of Anticipated and Experienced Regret and Pride on Investors’ Future Selling DecisionsPreprint
Lee, C. K. M., Kräussl, R., & Paas, L. J. (2009) · SSRN Electronic Journal · doi:10.2139/ssrn.1512493 · Cited by 3
Scheer, J., Costa, F., Molinos, M., Areias, A., Janela, D., Moulder, R. G., Lains, J., Bento, V., Yanamadala, V., Cohen, S. P., et al. (2022) · Journal of Medical Internet Research · doi:10.2196/41306 · Cited by 18
Stankovic, M., & Slavković, M. (2025) · Healthcare · doi:10.3390/healthcare13131547 · Cited by 22
“The sample size of 647 subjects is significantly above the recommended minimum limit [53], which is why the data are considered suitable for PLS-SEM computation.”
Yuan, Y., Bai, B., & Xu, S. (2025) · Marketing Intelligence & Planning · doi:10.1108/mip-03-2024-0141 · Cited by 21
Squiccimarro, E., Lorusso, R., Consiglio, A., Labriola, C., Haumann, R., Piancone, F., Speziale, G., Whitlock, R., & Paparella, D. (2024) · Journal of Cardiothoracic and Vascular Anesthesia · doi:10.1053/j.jvca.2024.12.013 · Cited by 18
Du, H., Huang, H.-T., Li, D., & Zhang, X.-N. (2024) · BMC Nursing · doi:10.1186/s12912-024-02345-6 · Cited by 18
“Previous studies have shown that SEM analysis is suitable when the sample size is ≥ 200 [30].”
Cao, Y., & Wang, J. (2024) · British Food Journal · doi:10.1108/bfj-04-2023-0309 · Cited by 18
Ding, Q., & Wu, Q. (2023) · Applied Research in Quality of Life · doi:10.1007/s11482-023-10144-5 · Cited by 28
Sahadev, S., Malhotra, N., Kannangara, L. N., & Ritchie, B. (2023) · Journal of Travel Research · doi:10.1177/00472875221145129 · Cited by 18
“The measurement model was found to provide a good fit to the data ( χ 2 /d f = 2.164; CFI = 0.949; IFI = 0.95; RMSEA = 0.062), as values for CFI and IFI were > 0.90 and the value for RMSEA was < 0.07 (Iacobucci, 2010; Nunkoo & Ramkissoon, 2012; Steiger, 2007).”
MethodInfluentialScheer, J. K., Areias, A. C., Molinos, M., Janela, D., Moulder, R. G., Jr., Laíns, J., Bento, V., Yanamadala, V., Correia, F. D., & Costa, F. M. T. A. (2023) · JMIR mhealth and uhealth · doi:10.2196/44316 · Cited by 21
“Mean changes in clinical outcomes for both urban and rural groups following an intent-to-treat analysis are presented in Table 4, while the corresponding model estimates and model fitness are presented in Multimedia Appendix 1, Tables S3 and S4, respectively [60,61].”
MethodOktari, R. S., Latuamury, B., Idroes, R., Sofyan, H., & Munadi, K. (2022) · International Journal of Disaster Risk Reduction · doi:10.1016/j.ijdrr.2022.103290 · Cited by 18
Do consumers follow their heart or mind when purchasing global brands? Empirical insights
Naseem, N., & Yaprak, A. (2022) · Journal of Global Marketing · doi:10.1080/08911762.2022.2113949 · Cited by 17
“The following indicators for “Goodness of Fit” were used for our SEM analysis – Maximum Likelihood Ratio Chi-Square (χ 2), Root Mean Square Error of Approximation (RMSEA), Non-Normed Fit Index (NNFI), Comparative Fit Index (CFI), and Standardized Root Mean Square Residual (SRMR) as proposed by (Iacobucci, 2010).”
MethodCOVID-19 Pandemic and Business Survival as Mediation on the Performance of Firms in the FMCG-Sector
Adejare, B. O., Olaore, G. O., Udofia, E. E., & Adenigba, O. A. (2022) · Athens Journal of Business & Economics · doi:10.30958/ajbe.8-3-3 · Cited by 18
“The recommended 200 sample size (Iacobucci 2010) was met given that the sample size used for this study is six hundred and seventy (670).”
MethodFactors affecting household solid waste generation and management in Sri Lanka: an empirical study
Zhao, Y., Diunugala, H., & Mombeuil, C. (2021) · Environmental Monitoring & Assessment · doi:10.1007/s10661-021-09633-7 · Cited by 18
“, 1995; Tabachnick & Fidell, 2001; Tinsley & Tinsley, 1987) while others have suggested sufficient sample size equal or higher than 200 as the rule of thumb (Boomsma & Hoogland, 2001; Iacobucci, 2010; Kline, 2005), which thus support the size of our sample.”
ResultKar, S., & Jha, K. N. (2021) · Journal of Construction Engineering and Management · doi:10.1061/(asce)co.1943-7862.0002125 · Cited by 30
Ludyga, S., Gerber, M., Brand, S., Möhring, W., & Pühse, U. (2021) · British Journal of Educational Psychology · doi:10.1111/bjep.12445 · Cited by 25
Metadata
- Authors
- Iacobucci, D.
- Affiliations
- Vanderbilt University (US)
- Corresponding author
- Iacobucci, Dawn
- ORCID
- Iacobucci, Dawn
- Venue
- Journal of Consumer Psychology
- Publisher
- Wiley
- Published
- 2009-10-03
- Volume
- 20
- Issue
- 1
- Pages
- 90-98
- ISSN
- 1057-7408 (ISSN-L)
- 1532-7663
- OpenAlex
- W2038318317
- Cited by
- 2,263
- References
- 0
- Citations by year
- 2026: 111 · 2025: 193 · 2024: 193 · 2023: 186 · 2022: 210 · 2021: 208 · 2020: 158 · 2019: 193 · 2018: 169 · 2017: 129 · 2016: 128 · 2015: 123 · 2014: 94 · 2013: 86 · 2012: 53
- FWCI
- 34.78
- Type
- journal article
- Language
- en
- Open access
- green
- papers.ssrn.com
- Locations
- Journal of Consumer Psychology (publishedVersion)
- SSRN Electronic Journal (submittedVersion)
- Topics
- Social Sciences › Decision Sciences › Management Science and Operations Research › Psychometric Methodologies and Testing
- Physical Sciences › Mathematics › Statistics and Probability › Statistical Methods and Bayesian Inference
- Physical Sciences › Mathematics › Statistics and Probability › Statistical Methods and Applications
- Keywords
- structural equation modeling, model fit indices, sample size, moderators, longitudinal data, mediation, measurement model, structural model
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