Sort by year.Then use YEAR as a BY variable and use the OUT= option to save the kernel densities to an output data set. You can use the SERIES statement in PROC SGPLOT to overlay the curves. If you don't want them overlaid, but are content with a panel, you can use PROC UNIVARIATE. In this case, use YEAR as a CLASS statement. See this example: http://support.sas.com/documentation/cdl/en/procstat/63963/HTML/default/viewer.htm#procstat_univariate_sect070.htm
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