Mention what is PROC in SAS?
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There are 200 observations in a dataset, i want to pull out the observation no's 100, 150,180,190 by using Proc SQL? How you can get it?
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data task; input id date date9. visit; cards; 101 01jan2015 1 101 02jan2015 2 101 06jan2015 3 102 04jan2015 1 102 07jan2015 2 102 12jan2015 3 103 06jan2015 1 103 13jan2015 2 ; run; write a program to find out missing dates between visits by each subject.
what are some problems you might encounter in processing missing values? In data steps? Arithmetic? Comparisons? Functions? Classifying data? : Sas programming