Dear developers, I thought that the following "if" conditions are supposed to give the same results but they actually don't. And the 2nd "if" block ignores "NA" values and treats them as numeric!!! Is that normal? Best, Artur <hansl> nulldata 10 series x = normal(0,1) x[2]=NA x[5]=NA test1 = abs(x)>=0.5 series test2=NA series test3=NA loop for i=1..$nobs test2[i] = abs(x[i])>= 0.5 ? 1: 0 endloop loop for i=1..$nobs if abs(x[i])>= 0.5 test3[i] = 1 else test3[i] = 0 endif endloop print x test1 test2 test3 --byobs </hansl>