[S] Help on plotting two plots in to the same graph sheet

Maria Grazia Collu (mgcollu@vaxca1.unica.it)
Wed, 1 Jul 1998 19:26:41 +0100 (GMT+0100)

I'm trying to compare two curve (kaplan-Mayer and AALEN) in an
application of COX models.
Does someone know how ?
Thank you !
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