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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: RE: problem with ciplot |

Date |
Wed, 27 Aug 2003 15:07:54 +0100 |

cecilia vidal > I have a dataset of children with two dummy variables indicating the > proportion of deaths (one for boys and one for girls) > before age of five: > > gen u5yrd_m=.; replace u5yrd_m=1 if (sex==1 & died==1); > replace u5yrd_m=0 if > (sex==1 & died==0); > gen u5yrd_f=.; replace u5yrd_f=1 if (sex==2 & died==1); > replace u5yrd_f=0 if > (sex==2 & died==0); > > I would like to plot the proportions with confidence > intervals for both > variables in one graph using > ciplot u5yrd_m u5yrd_f, by(groupvar); > > but i keep getting the message "no observations". Would > anyone know why is > this happening? Let me replay your operations, with some simplification, gen u5yrd_m = died if sex==1 gen u5yrd_f = died if sex==2 ciplot u5yrd_m u5yrd_f, by(groupvar) You have variables for male and female deaths. When male deaths are not-missing female deaths are missing, and vice versa. -ciplot- by default will not proceed further, because it expects to work on the same set of observations. (A way to get closer to what -ciplot- is thinking is to set trace on and see where you are ejected.) There are two choices: 1. Cecilia is working with some version of -ciplot- before 1.1.0. -ciplot- 1.1.0 has an undocumented -inclusive- option added on 18 August 2003, which can be used to override this default. The syntax would be ciplot u5yrd_?, by(groupvar) inclusive This 1.1.0 is not yet on SSC. I'll send a copy to Cecilia privately. 2. A different data structure. There is some -groupvar- here unexplained, but presumably it is something other than -sex-. egen GROUPVAR = group(sex groupvar), label ciplot died, by(GROUPVAR) should move you closer to where you want to be. You will probably have to work a bit on the labelling. By the way, -ciplot- works with similar syntax to -ci-. If you wanted binomial or Poisson confidence intervals, you need to state that explicitly. Nick n.j.cox@durham.ac.uk * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: problem with ciplot***From:*vidalc@who.int

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