StatisticsChapter 11Moderation, mediation, and multi-category predictors The conceptual model Moderation: for a statistical model to include the combined effect of two or more predictor variables on an outcome.This is in statistical terms an interaction effect.A moderator variable: one variable that affects the relationship between two others.Can be continuous or categorical.We can explore this by comparing the slope of the regression plane for X ad low and high levels of Y.The statistical model Moderation is conceptually.Moderation in the statistical model. We predict the outcome from the predictor variable, the proposed variable, and the interaction of the two.It is the interaction effect that tells us whether moderation has occurred, but we must include the predictor and moderator for the interaction term to be valid.Outcomei = (model) + erroriorYi = (b0 + b1iX1i + b2iX2i + … + bnXni) + ƐiTo add variables to a linear model we literally just add them in and assign them a parameter (b).Therefore, if we had two predictors labelled A and B, a model that tests for moderation would be expressed as:Yi = (b0 + b1Ai + b2Bi + b3ABi) + ƐiThe interaction is ABiCentring variables When an interaction term is included in the model the b parameters have a specific meaning: for the individual predictors they represent the regression of the outcome on that predictor when the other predictor is zero.But, there are situation where it makes no sense for a predictor to have a score of zero. So the interaction term makes the bs for the main predictors uninterpretable in many situations....

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Discovering statistics using IBM SPSS statistics by A. Field (5th edition) a summary

Discovering statistics using IBM SPSS statistics by A. Field (5th edition) a summary

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This is a summary of the book "Discovering statistics using IBM SPSS statistics" by A. Field. In this summary, everything students at the second year of psychology at the Uva will need is present. The content needed in the thirst three blocks are already online, and the rest will be uploaded soon.