rank sum

Dear all, I already found useful information to calculate my tests however minor questions are left. I have a data-set of around 200 participants in 4 groups, unequally distributed. For every participant I have 12 Likert-Items (called A_219 to A_230) To compare these Items with each other I...

Hello Everybody, Can the Wilcoxon rank sum test be used when the variable of interest is binary? For example, say I have a control group and a treatment group, and I am interested in seeing whether the treatment group goes to college more than the control group. The variable "college" takes...