Hello, Basically, I am trying to see if Variable X, for which I have monthly values, changes over time for participants. I have created a dataset where for each subject their values for Variable X are printed for each month in the time period. Unfortunately, sometimes Variable X is missing for a subject. I tried to insert an array as follows: data mydata; array varx value1--value60; do i=1-70; if varx(i)=. then varx(i)=varx(i-1); end; run; Unfortunately this creates two problems. One is what to do if participants' first value for Variable X is missing. The second is that I keep getting an error message that all variables in array list must be the same type. Considering that all the variables in the array list are numeric, I'm not sure why I'm getting this error message or how to fix it. Any assistance is much appreciated.
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