Ineta Sokolowski <IS@ALM.AU.DK> asks:
> I would like to make one graph with 4 survival curves after estimation of
> Cox regression, but I can not plot the reference group in same plot with
> rest of the groups. I write following comands:
> .stset time, failure(response=1)
>
> .xi: stcox i.group4, basesurv(baseline)
> .stcurve, surv at1( _Igroup4_2=1) at2( _Igroup4_3=1) at3( _Igroup4_4=1)
> Variable group4 have values 1, 2, 3 and 4.
> Is there a posibility to plot all the 4 curves in the same graph?
Sure.
. local oldopts at1(_Igroup4_2=1) at2(_Igroup4_3=1) at3(_Igroup4_4=1)
. stcurve, surv `oldopts' at4(_Igroup4_2=0 _Igroup4_3=0 _Igroup4_4=0)
That is, simply add the new -at4()- option to what you currently have. The
reference group (-group4==1-) is that for which all indicators are zero.
--Bobby
rgutierrez@stata.com
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