The contents in the variable for example 1 2 3 etc. all refer to the value of the variable year. The data I obtained them from an Excel spreadsheet, the first 14 years, from 2000 2001 and so on up to 2013 (each year has other variables with economic values) belong to a group and the other 14 years from 2000 to 2013 come from an another source to do statistical checks In SAS data sets I have the first 14 years, one for each observation and related variables, after the record year 2013 belongs to the first group, the second group starts from 2000 2001 and so on until 2013, so I have to create a classification variable to which I intend to assign 0 for the first group and 1 for the second, otherwise I can not distinguish
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