I'm trying to learn PCA and am struggling with the concept of orthogonal lines, and why they need to be orthogonal.
Is it correct to say that if two lines are orthogonal to each other then they are uncorrelated, independent or both?
if I define contrasts for a factor variable with n levels, e.g.
contrasts(x) <- c(-2,1,1)
and I subsequently display these contrasts via
I obtain - beside the self-defined contrasts- (n-1) additional contrasts (second row):
I'm setting up a customer research using a conjoint analysis (SPSS) and have a few questions.
1. Do I need to set up the syntax file before collecting answers or can I do that afterwards?
2. Is there a way to change the orthogonal design (in SPSS) after I've run it? Or do I...
We've been given this question on a sample exam paper.
An experimenter is exploring the effects of two appetite suppressants in rats. Suppressant A induces mild nausea, while Suppressant B suppresses the sensation of hunger. Half the subjects receive a low dose of one suppressant, and half...