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並前往https://blogs.sas.com/content/iml/2018/02/26/how-to-use-first-variable-and-last-variable-in-a-by-group-analysis-in-sas.html

How to use FIRST.variable and LAST.variable in a BY-group ...

This article gives several examples of using the FIRST.variable and LAST.variable indicator variables for BY-group analysis in the SAS DATA ...

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