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

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

Subject |
Re: st: "for...: graph" question |

Date |
Wed, 2 Apr 2003 17:14:34 +0100 |

Cathy L. Antonakos > I am printing graphs for temperature data collected at multiple time > points. One graph for each person in a data file. It's a two way graph. > I managed to create one graph per person using > for num=1001/1011: graph temp order if id==X ... etc. > However, if the subject id is completely missing from the file, > the graph still prints (empty) for that person. > I tried to include "if order~=." after the "graph" command > (e.g., to skip cases with missing data on one or > the other variable). It didn't work. > Is the problem that the case simply doesn't exist in the file, > so there is no data to operate on to figure out whether a > variable is missing or not? > If I embed a blank record within the file for any subject who > is missing data and who falls within the series from 1001 to 1011, > will that enable me to override with an "if order~=." statement > in the "graph" command? > How would I do this? > Suggestions welcome. I am a fairly new Stata user, so the simpler > the suggestion, the better. Thanks. All Statalist members are asked to state the version of Stata they are using. Please see http://www.stata.com/support/statalist/faq/#advice I guess Stata 7 in your case. The FAQ at http://www.stata.com/support/faqs/data/for.html applies. Perhaps the easiest solution for you is egen group = group(id) su group, meanonly forval i = 1/`r(max)' { su id if group == `i', meanonly graph temp order if group == `i', t1(id is `r(max)') } This may look worse than you want -- it is worse than you want -- but some extras have been written in. The -egen- statement creates a variable -group- guaranteed to have consecutive integers from 1 up as values. You still need to know the highest value of -group-, which -summarize- leaves behind in `r(max)'. In producing a bundle of these graphs, things can get very confusing unless each is labelled, so as an extra step, the -id- for each graph is shown explicitly. -for- is a deadend and goes undocumented in Stata 8, so starting now on -forvalues- and -foreach- will pay enormous dividends in your Stata career. In Stata 8, there is a cleaner solution: levels id, local(levels) foreach l of local levels { line temp order if id == `l', subtitle(id is `l') } once -levels- has been installed from SSC. You do not need to mess with your data, at any rate. 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/

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