@Juanjuan wrote: The error message you posted has nothing to do with the code you posted. The only way to generate that error message is if you were trying to use the value of a macro variable as the name of the macro variable to use as you %DO loops index variable. 49 %macro test(mvar_name); 50 %do &mvar_name=1 %to 2; 51 %put MVAR_NAME=|&mvar_name| &mvar_name=|&&&mvar_name| ; 52 %end; 53 %mend test; 54 %test(fred); MVAR_NAME=|fred| fred=|1| MVAR_NAME=|fred| fred=|2| 55 %test(); ERROR: The macro variable name is either all blank or missing. ERROR: is an invalid macro variable name for the index variable of the %DO loop. ERROR: The macro TEST will stop executing. Perhaps the problem is as simple as an unwanted ampersand? Setting the SYMBOLGEN option should let you find out what macro variable is being used in this way and make it easier to locate in your code. 56 options symbolgen; 57 %test(); SYMBOLGEN: Macro variable MVAR_NAME resolves to ERROR: The macro variable name is either all blank or missing. ERROR: is an invalid macro variable name for the index variable of the %DO loop. ERROR: The macro TEST will stop executing. 58 options nosymbolgen; ... View more

thanks a lot. ... View more

Thanks for your response. So the difference between NumberAtRisk and Atrisk are: l Observations with tied WEEK values 6.28571, 8.42857 etc.(I know this difference). l Observations added by survival(atrisk=0 to 10 by 2): I'm confused with this difference. I'm confused the rule to impute Atrisk for For the added week 4,6,10 which was not in NumberAtrisk. Take Week4 for example, week4 is between week=2.42857/NumberAtRisk=15 and week=4.42857/ NumberAtRisk=14, so we should impute week=4 by 14 because of week=4 is closer to week=4.42857? And how to handle with week=10? [cid:image001.png@01D374ED.FE2F4BE0] [cid:image002.png@01D374ED.FE2F4BE0] ... View more