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From |
Jacob Wegelin <jwegelin@vcu.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: zoom in on a Kaplan-Meier plot (display only a subset of the timeaxis) |

Date |
Wed, 1 Oct 2008 16:50:41 -0400 (EDT) |

Is there a way to create a Kaplan-Meier plot that is "zoomed in" on a subset of the time axis? To make this concrete: It is easy to create a twoway plot that is "zoomed in" on a portion of the axes, for instance:

clear

set seed 5

set obs 30

gen ID=_n

gen x=invnormal(uniform())

gen y= -2 * x + invnormal(uniform())

twoway (scatter y x , aspectratio(1))

twoway (scatter y x if x<1/2 & x>0, aspectratio(1))

/*

The second plot "zooms in" on the first.

But what if we have survival data? The second sts graph command below does *not* do what I want; it creates a subset of the data and builds a Kaplan-Meier plot afresh using that subset. Is there any straightforward way to make a "zoomed-in" Kaplan-Meier plot? /*

clear

set seed 5

set obs 30

gen ID=_n

gen t=exp(uniform()) - 1

stset t

sts graph sts graph if t > 0.5 & t < 0.8

Thanks for any ideas

Jacob A. Wegelin

jwegelin@vcu.edu Assistant Professor

Department of Biostatistics

Virginia Commonwealth University

730 East Broad Street Room 3006

P. O. Box 980032

Richmond VA 23298-0032

U.S.A. http://www.people.vcu.edu/~jwegelin

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**Follow-Ups**:**st: RE: zoom in on a Kaplan-Meier plot (display only a subset of the time axis)***From:*"Lachenbruch, Peter" <Peter.Lachenbruch@oregonstate.edu>

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