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From |
sjsamuels@gmail.com |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: AW: customising ranges of the axis in Kaplan Meier plot |

Date |
Thu, 8 Oct 2009 09:05:31 -0400 |

You are quite right Nick. -levelsof- and -separate- give identical results. The difference I saw arose because y I named the augmented (0,0) points incorrectly when I tested -separate-. -Steve On Wed, Oct 7, 2009 at 10:53 AM, Nick Cox <n.j.cox@durham.ac.uk> wrote: > I don't see any reason why using -separate- as compared with generating > separate variables yourself should mean anything different in ensuing > graphs. The result is the same, a bunch of disjoint variables. > > Nick > n.j.cox@durham.ac.uk > > sjsamuels@gmail.com > > This question has been before on statalist, and a google search > (statalist restrict range kaplan-meier) would have found an answer > (e.g. http://www.stata.com/statalist/archive/2005-03/msg00229.html) > > The ordinary graph axis commands don't work with -sts graph-. The only > way to restrict the axes is to generate the points for the CDF with > -sts- gen (see below) and plot them with -twoway-. I use -levelsof- > below. Nick Cox pointed out that -separate- should do essentially > the same thing, but I've observed that the plot connections look > different. To make the graph look nice you might have to augment the > data for each group with a fake point at (0,0), since zero times are > not allowed in -sts- . > > -Steve > > > ******************************************* > sts gen surv = s, by(factor) > gen cdf =100*(1-surv) > > **************************************************** > * Create a separate CDF for each factor level > **************************************************** > sort factor outcome > levelsof factor, local(fac_lev) > foreach i of local fac_lev { > gen ydf`i' = cdf if factor==`i' > } > > twoway scatter ydf* outcome if cdf<= 0.5, > connect(J J....) > > ************************************************** > > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > -- Steven Samuels sjsamuels@gmail.com 18 Cantine's Island Saugerties NY 12477 USA 845-246-0774 * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: customising ranges of the axis in Kaplan Meier plot***From:*"Isabelle Deltour" <deltour@cancer.dk>

**st: RE: AW: customising ranges of the axis in Kaplan Meier plot***From:*"Isabelle Deltour" <deltour@cancer.dk>

**Re: st: RE: AW: customising ranges of the axis in Kaplan Meier plot***From:*sjsamuels@gmail.com

**RE: st: RE: AW: customising ranges of the axis in Kaplan Meier plot***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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