Hello,  I am trying to complete a backward elimination analysis to select covariates for a logistic regression model. I would like to retain my key exposure variable (quartile_SDI) in the model, and only consider removing potential confounding variables, but I am struggling to figure out the code. Below is the code that I am using: proc logistic data=pas.ranked_quart_3; class RBC_4 (ref='0') ante_dx (ref='1') anemic (ref='0') anyDM (ref='0')/ param=ref; model RBC_4 = quartile_SDI age BMI_delivery prior_CS ante_dx anyDM anemic / selection=backward fast slstay=0.1 ctable pprob=(0 to 1 by 0.05); run;   Any guidance would be appreciated. Thank you for your help! Alison   ... View more

Hello,    I just finished installing SAS 9.4 on Windows 10 via Parallels on my new Macbook Air (M1 chip). The installation seemed to go smoothly and now I have SAS 9.4 on my laptop, but every time I click the icon the SAS program opens and then closes/crashes immediately. There is no error message, I just see the blue circle/thinking sign, then the program closes completely within a few seconds. I have tried re-starting Windows with no improvement.   Any ideas? Could this be related to a compatibility issue with the M1 chip?    Thank you for your help! Alison   ... View more