search for: dichotomised

Dear expeRts, I am currently struggling with the problem of finding cut points for a set of stimulus variables. I would like to obtain cut points iteratively for each variable by re-applying a dichotomised variable in the model and then recalculate it. I planned to have fixed names for the dichotomised variables so I could use the same syntax for every recalculation of the whole model. I furthermore want to reiterate the process until no cut point changes any more. My problem is in accomplishing thi...

...that I am including as control variables. I have a large dataset from nearly 4,000 individuals. I need to check whether my data is 1) Missing at Random (MAR) and 2) Missing Completely At Random (MCAR). Here are three questions that I have related to this: 1) To check whether the data is MAR, I dichotomised a variable into missing and not missing, and checked for any significant differences in means (for continuous) or proportions (for categorical) of the other variables. I did this for each of the variables in my analysis. Is this correct? 2) Because of the size of my dataset, relationships for my M...