Interactions. POL 242 Renan Levine March 13/15, 2007. Recap. Learned how to do bivariate analyses Cross-tabs, measures of association, correlations. Added variables. Learned to do multivariate regression analyses. Learned to interpret coefficients when controlling for all other variables.
March 13/15, 2007
Will this relationship be the same at all levels of Z???
YFocus on the relationship
When Z = α
Can be positive or negative.
Can be strong, weak or have no effect.
When Z = β
NOT what is the effect of Z on Y.
See Pollock p. 86 for a complete set of possible interactions.