USING PANEL DATA ANALYSES IN PSYCHOLOGICAL LONGITUDINAL RESEARCH: DYNAMICS OF PTSD SYMPTOMS DETERMINANTS (Wykorzystanie danych panelowych w psychologicznych badaniach podluznych na przykladzie oceny dynamiki uwarunkowan objawow PTSD)
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The main aim of this paper is to demonstrate how psychological longitudinal research data can be analysed using panel data methods. The determinants of dynamics of PTSD symptoms are used as an example. The approach used here allows for treating data from three measures as unity and incorporating them into one model, instead of estimating three independent data sets. It enables for formal verification of the independent variables – temperamental traits and trauma characteristics – influence on the dependent variable – dimensionally expressed PTSD symptoms intensity. As a result it is possible to verify the hypothesis of different influence of trauma intensity on PTSD symptoms in different family members by comparing parametres' estimates in one model encorporating group of interactive variables. Such approach seems to be an interesting option, contrary to comparisons of parametres' estimates derived from different models.
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