I have two independent measures of my dependent variable. I hypothesized that one of the two is better in prediction the dependent variable. Let’s imagine that I would have measured the height of a bottle with (a) a ruler and (b) just my hand span. I want to be able to say that a...
My goal is to measure environmental attitude (EA). To do that I want to construct a scale and use a Rasch model to estimate item and person scores.
My study design is the following.
1. I want to measure EA as a base
2. I want to introduce a cognitive dissonance intervention (or control...