I have a data set with a column that indicates poor sleep, but instead of filling in all of the cells, they only indicated "y" if the patient had poor sleep. How can I fill in the blank cells so they contain "n"? I tried making a new column: DATA polphar.Polypharm_DataV3; SET polyphar.polypharm_data; IF poor_sleep= "." then poor_sleepYN= "N"; IF poor_sleep= "y" THEN poor_sleepYN= "Y"; RUN; But it keeps giving me this error: ERROR: Libref POLPHAR is not assigned. I am using SAS University Edition.
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