When you calculate log_personyears in your DATA step, I assume you do something like:
log_personyears = log (personyears);
So if you wish the offset to be per 1000 personyears, change that calculation to
log_thoupersonyears = log(1000*personyers);
Let us know if that does what you need.
SteveDenham
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ANOVA, or Analysis Of Variance, is used to compare the averages or means of two or more populations to better understand how they differ. Watch this tutorial for more.