Growth Curve Model Using SEM. David A. Kenny. Thanks due to Betsy McCoach. Linear Growth Curve Models. We have at least three time points for each individual. We fit a straight line for each person: The parameters from these lines describe the person. Nonlinear growth models are possible.
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David A. Kenny
Thanks due to Betsy McCoach
Means become knowns: T(T + 3)/2
Should not use CFI and TLI (unless the independence model is recomputed; zero correlations, free variances, means equal)
some intercept variance, and slope and intercept being positively correlated
no intercept variance
intercept variance, with slope and intercept being negatively correlated
M1 + M3 – 2M2 = 0
(where “M” is mean)
i.e., the means have a linear relationship with respect to time.