st: How to overlay four Cox survival curves in one graph

[agnes cheah <agnesxie4@gmail.com>]

Hi,

I have plotted two separate Cox survival curves (corresponding to two Cox
models). How do I overlay the two plots (containing 2 curves, because
stcurve, by variable command used) into one single graph)? I tried graph
combine (not what I want) and addplot (does not seem to work).

Hope you can assist with this.

Thanks

Regards,
Agnes
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