Hi Reeza, thanks for your reply it's survival analysis. my follow up time 1 day to 12 years i did a km curve for my data for 12 years period, treatmetn group has 4 (0,1,2,3) i did it in stata, but they don't have adjusted logrank test ( i can find the answer for online), so i found SAS command , i decided to use SAS for my analysis to do the adjusted logrank test. then i divide the data into 0-1 year( after 1 year if they died it's censored) then i divide the data into 2 to 3 years and 4 to 5 years i did example in stata and SAS for adjustment for logrank test data i took it from your website. https://support.sas.com/documentation/cdl/en/statug/63033/HTML/default/viewer.htm#statug_lifetest_sect019.htm i am attaching the file thanks Sugi
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