I'd still like to know now to do it. But I got rid of it by removing the STRATA and FORMAT statements from the LIFETEST itself, now that we have modified this plot so that only there are no longer multiple strata (which is why this suddenly came up, on deadline day).
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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.