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| From | Denisa Mindruta <mdenisa@yahoo.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | st: identify unique string values within lists of elements over chosen time windows |
| Date | Thu, 21 Mar 2013 16:22:54 -0700 (PDT) |
Hi everyone. I have an unbalanced, large panel dataset, where each observation can take multiple string values (each string is stored in a separate variable). At each point in time, I need to count whether the string value(s) taken by an observation are "new" , meaning that they do not show up among the values taken by the same observation in previous years. How should I approach this problem ? Thanks ! Below is a description of data. I need to calculate newval obs yr var1 var2 var3 newval 1 90 str1 str2 str3 3 1 91 str1 str4 str5 2 2 90 str3 str4 2 2 91 str4 str5 1 2 93 str3 str5 0 2 94 str7 1 * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/