Thank you.. your idea of >0 removed the log problem. I did use the correct dataset in my program but i guess typed it wrong in the sample code that i sent. I am sorry .Thank you very much though. ... View more

Thank you Rick for getting back to me. variable(dose)  values are  for example 1 1 1 1 1 1.5 1.6 ... data ds(keep =usubjid  dose); set datax; where dose ne  . ; dose1 =log(dose); run; when i do this where ever dose values are equal to 1 i get dose1 =0 i get a note in logafter i run that part of the code as "mathematical operations could not be performed "and there is "an invalid argument to function log". then i did proc means data =datax ; by usubjid; var dose1; output out =datax1   n=n   mean=mean   stderr=stderr; run; the datax1 dataset has values where mean=o and std err=0 and also some values where stderr =missing. ... View more

Thankx for reaching out to me. I do have logarithmic values of the variable as zero since there are some values of the variable which are 1 and when i take log(1) it gives me zero.further to that i take mean of the log value of the variable and st error . the mean as well as stderror comes as missing. all i want to do is take the log of a variable and then plot mean of the log with the stderror.but the variable has some 1 values. ... View more