Estimating true short-term consistency in vocational interests: A longitudinal SEM approach

This study aimed at estimating the correlation between true scores (true consistency) of vocational interest over a short time span in a sample of 1089 adults. Participants were administered 54 items assessing vocational, family, and leisure interests twice over a 1-month period. Responses were analyzed with a multitrait (MT) model, which supposes no temporal change, and a latent change (LC) model with temporally stable method effects. The LC model fitted the data well in 75% of cases whereas the MT never held. Error measurement is not sufficient in explaining the imperfect test–retest manifest correlations. True consistency estimates were very high with an average of .87, suggesting that although true temporal change occurs even within short periods its magnitude is rather limited.