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From |
Steve Nakoneshny <scnakone@ucalgary.ca> |

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

Subject |
st: loop within a loop |

Date |
Thu, 10 Nov 2011 13:41:04 -0700 |

Dear Statalist, I'm working with a dataset of biomarker data. This dataset contains triplicate scores on 16 unique biomarker measures for a total of 48 variables. Each measure has a unique name (obviously) and each scoring of these appends a letter to the end of the varname like this: v1_A v1_B v1_C ... v16_A v16_B v16_C. Wanting to calculate new variables for min max and mean scores and then order these results relative to each biomarker measure, I thought I would write a loop to do so rather than write ~64 lines of code. This is what I did: -start code- local y v1_ v2_ v3_ v4_ ... v16_ local i 0 foreach x of local y { local ++i egen `x'min = rowmin(`x'A - `x'C) egen `x'max = rowmax(`x'A - `x'C) egen `x'mean = rowmean(`x'A - `x'C) order `x'min `x'max `x'mean, after(`x'C) } - end code- As far as I can tell, the code executes exactly as I wanted and I now have my new variables created and ordered as planned. What is bugging me though is thinking that I could combine the -egen- commands into a loop and nest it into the larger loop. I suspect that I would first have to create -local a min max mean- and rewrite the -egen- command as -egen `x'`a' = row`a'(`x'A - `x'C)- (and then delete the two superfluous -egen- commands). However, that in and of itself will not be sufficient and I don't know enough to provide the appropriate syntax to have the loop execute correctly. I am still relatively new to using loops and would appreciate some suggestions. Thanks, Steve Nakoneshny scnakone@ucalgary.ca * * 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/

**Follow-Ups**:**Re: st: loop within a loop***From:*Matthew White <mwhite@poverty-action.org>

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