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

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

Subject |
Re: st: loop within a loop |

Date |
Thu, 10 Nov 2011 14:06:00 -0700 |

Hi Matt, Thank you for the quick response! Despite -help foreach- and the two Stata Press books in front of me, I just wasn't getting it. After modifying my do file as per you suggestion, I realized I could also incorporate the -order- command into the nested loop thus: -start code- foreach x of local y { foreach stat in min max mean { egen `x'`stat' = row`stat'(`x'A - `x'C) order `x'`stat', after(`x'C) } } -end code- Thanks again, Steve Nakoneshny scnakone@ucalgary.ca On 2011-11-10, at 1:49 PM, Matthew White wrote: > Hi Steve, > > -egen `x'`a' = row`a'(`x'A - `x'C)- is exactly along the lines you > want. You could try: > > -start code- > > local y v1_ v2_ v3_ v4_ ... v16_ > local i 0 > > foreach x of local y { > foreach stat in min max mean { > egen `x'`stat' = row`stat'(`x'A - `x'C) > } > order `x'min `x'max `x'mean, after(`x'C) > } > > - end code- > > Nothing beats reading the help file: -help foreach-. > > Best, > Matt > > On Thu, Nov 10, 2011 at 3:41 PM, Steve Nakoneshny <scnakone@ucalgary.ca> wrote: >> 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/ >> > > > > -- > Matthew White > Data Coordinator > Innovations for Poverty Action > 101 Whitney Avenue, New Haven, CT 06510 USA > +1 434-305-9861 > www.poverty-action.org > > * > * 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/ * * 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>

**References**:**st: loop within a loop***From:*Steve Nakoneshny <scnakone@ucalgary.ca>

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

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