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From |
WEBER Sylvain <sylvain.weber@unine.ch> |

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

Subject |
Re: st: Double loop over unbalanced panel |

Date |
Sat, 3 Nov 2012 05:53:52 +0000 |

Hi. I think you don't need any loop. - by - can be used instead. Try bysort id (t): replace chc=(chc[_n-1]*ph+cont)/p if mi(chc) Note that the - if mi(chc) - condition is very important. Otherwise, you would replace all values of chc; not only missing values. Best, Sylvain Le 2 nov. 2012 à 14:00, "Fernando Luco" <flucoestatalist@gmail.com> a écrit : > Hi Nick, > > The data and the formula look as follows > > input id t str1 ch p str1 chh ph cont con_c chc > 1 1 "a" 2 "" . 1 0.5 1 1 > 1 2 "b" 3 "a" 4 3 1 . > 1 2 "b" 3 "a" 4 3 1 . > 1 3 "a" 1 "b" 2 2 2 . > 1 4 "c" 4 "a" 3 3 .75 . > 1 5 "d" 2 "c" 5 1 .5 . > 2 3 "d" 2 "" . 1 1 2 > 2 4 "a" 3 "d" 3 3 1 . > 2 5 "b" 1 "a" 2 2 2 . > 2 6 "a" 2 "b" 2 1 .5 . > end > > foreach k of numlist 1/2{ > foreach w of numlist 2/T_k{ > replace chc=(chc[`w'-1]*ph+cont)/p if _n==`w' & id==`k' > } > } > > Thanks, > > Fernando > > On Fri, Nov 2, 2012 at 3:39 PM, Nick Cox <njcoxstata@gmail.com> wrote: >> I think the best advice depends on what -formula()- is, which you >> don't tell us. >> >> That said >> >> foreach of numlist ... >> >> in both your examples can be recast more simply as -forval- loops. >> >> Nick >> >> On Fri, Nov 2, 2012 at 8:12 PM, Fernando Luco <flucoestatalist@gmail.com> wrote: >>> Hi, >>> >>> I have an unbalanced panel and I need to do a loop over individuals and >>> observations. My data looks as follows (I have other variables that are not >>> represented in this example) >>> >>> id t chc >>> 1 1 .5 >>> 1 2 . >>> 1 3 . >>> 1 4 . >>> 1 5 . >>> 2 3 1 >>> 2 4 . >>> 2 5 . >>> 2 6 . >>> >>> What I want to do is, for each individual (id) to complete the values in >>> chc according to a formula that depends on other variables. However, the >>> number of times that each individual appears differs across individuals. I >>> would like to do something such as >>> >>> foreach k of numlist 1/2 { /*the 2 has to be changed to the total number of >>> individuals*/ >>> foreach w of numlist 2/T_k { /* where T_k corresponds to the number of >>> times individual 2 appears*/ >>> replace chc=formula(`w') >>> } >>> } >>> >>> I don't know how to define T_k in the correct way such that it varies >>> across individuals (so 5 for individual 1 and 4 for individual 2). >>> >>> Thanks, >>> >>> Fernando >>> * >>> * For searches and help try: >>> * http://www.stata.com/help.cgi?search >>> * http://www.stata.com/support/faqs/resources/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/faqs/resources/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/faqs/resources/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/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Double loop over unbalanced panel***From:*Nick Cox <njcoxstata@gmail.com>

**References**:**st: Double loop over unbalanced panel***From:*Fernando Luco <flucoestatalist@gmail.com>

**Re: st: Double loop over unbalanced panel***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: Double loop over unbalanced panel***From:*Fernando Luco <flucoestatalist@gmail.com>

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