interactions

Question 1

categorical * continuous

Answer 1

slope of regression line between a continuous predictor and the outcome is different across levels of a categorical predictor

Question 2

continuous * continuous

Answer 2

slope of regression line between a continuous predictor and the outcome changes as the values of a second continuous predictor change
- moderation

Question 3

categorical * categorical

Answer 3

difference in the difference between groups across the levels of a second factor

Question 4

what plotting of interaction is used for cat * cont and cont * cont

Answer 4

simple slopes
- regression of outcome y on a predictor x at specific values of interacting vairbale z

Question 5

ordinal interaction

Answer 5

lines don’t cross within plausible range of x measure
rank order of one predictor maintained across levels of another predictor
more common in observational studies

Question 6

disordinal interaction

Answer 6

lines do cross within plausible range of x measurement
rank order of one predictor is not maintained across levels of another predictor
most common in experimental work