6. Categorical Predictors: Comparing means Flashcards
In experimental research, predictors in the linear model are defined by…
a manipulation
The F-statistic quantifies the fit of the model to the data. What does the fit represent?
The experimental manipulation which defines the predictor
Significant fit equates to…
Significant effect of the experimental manipulation
You can code any categorical predictor into a series of ____ variables
dummy
The b for each dummy variable will be the difference in ____ between each category and the ____
means, baseline
Define overall fit
The ratio of how well the model fits to how much error it has
(model = differences between means
F = ratio of the experimental effect to the background ‘error’)
Tests whether group means differ overall
Parameter estimates break down…
and tell us specifically…
The overall fit
Which means differ
