Assumptions. In the lecture there are five different assumptions discussed: outliers, multicollinearity, homoscedasticity, linearity and normality distributed residuals. Look at the notes at the end in this document. Bootstrapping. You use bootstrap when distributions are not in agreement with the assumptions causing. Mediation = the relationship between an independent variable and a dependent variable via the inclusion on a third hypothetical variable, the mediator variable. When you do mediation you always have to use bootstrap, because there is an indirect effect. In dit college worden geen andere onderwerpen besproken dit niet worden behandeld in de literatuur. Er worden geen recente ontwikkelingen besproken. Er worden geen vragen gesteld over effects size op het tentamen. Er worden geen tentamenvragen behandeld. Assumptions and violationsOutlier may influence your results. If there is an outlier, you have to remove it, especially if it is a theoretical illogical value. Do analysis with and without and inspect whether conclusion is the same (but what if not). Leave it, but correct; e.g. use robust estimator (look at the median instead of the mean). Multicollinearity. Toleance = 1/VIF. Tolereance < .2 is a possible problem, tolerance < .1 is a problem. VIF > 5 is a possible problem, VIF > 10 is a problem. When predictors correlate strongly (> 0.8), it is impossible to compute unique estimations for the regression coefficients. The...
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