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Model Fit and Interpretation of Non-Linear Latent Growth Curve Models

Welch, Greg William (2007) Model Fit and Interpretation of Non-Linear Latent Growth Curve Models. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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This dissertation investigated the use of various techniques in modeling non-linear change in the context of latent growth modeling. A simulation study was conducted utilizing four between subjects factors: sample size (50, 75, 100, 150, 200, 300 and 500), slope variance (.15, .45 and .75), factor correlation (.15, .45 and .75) and growth curve (exponential, logarithmic and logistic). There was also a single within subjects factor: fit technique (quadratic, unspecified and spline). The outcomes of interest were the ÷2 model fit statistic and the following goodness-of-fit indices: CFI, GFI, AGFI, SRMR and RMSEA. Results indicated the unspecified technique provided the best statistical estimates of model fit while the quadratic technique provided the worst. This result was consistent across all of the between subject factor conditions. The spline technique performed very similarly to the quadratic technique. These results suggest applied researchers should pay very close attention when utilizing polynomial techniques and should also strongly consider the unspecified technique as either the model of choice or as a comparison to results obtained for another model.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Welch, Greg
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairKim, Kevin Hkhkim@pitt.eduKHKIM
Committee MemberStone, Clement Acas@pitt.eduCAS
Committee MemberIyengar, Satishssi@pitt.eduSSI
Committee MemberLane, Suzannesl@pitt.eduSL
Date: 27 September 2007
Date Type: Completion
Defense Date: 2 July 2007
Approval Date: 27 September 2007
Submission Date: 31 July 2007
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: School of Education > Psychology in Education
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: Latent Growth Curve Modeling; Non-Linear; Structural Equation Modeling
Other ID:, etd-07312007-173433
Date Deposited: 10 Nov 2011 19:55
Last Modified: 15 Nov 2016 13:47


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