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From |
Nick Cox <n.j.cox@stata.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: How to loop only over the periods in which the commands are feasible, and automatically ignore the others? |

Date |
Tue, 04 Aug 2009 09:37:45 -0500 |

The code might look like this forvalues i=458/515 { capture { reg delta L.delta if period==`i' replace beta = adjust * _b[L.delta] if period==`i' ... } } Another approach is something like forvalues i = 458/515 { qui count if period == `i' & delta != . if r(N) > 0 { ... } } where both tests if period == `i' & delta != . if r(N) > 0 should be replaced by any test more appropriate. In terms of (2), the most obvious error is forvalues i=period2_min(1)period2_max{

Nick Stata Chris wrote:

(1) I wanted to run the loop below, where for some of the periods either delta or L.delta does not exist. Now it seems that with the code below, rather than executing the commands for the periods where the necessary observations do exist and ignoring the others, what happens is that whenever at least for one period the command cannot be executed Stata gets stuck entirely. Is there a smart way to tell it to just ignore those periods and continue with the next one? . gen beta = . . gen se_beta = . . gen t_beta = . . forvalues i=458(1)515 { . reg delta L.delta if period==`i' . replace beta = adjust * _b[L.delta] if period==`i' . replace se_beta = adjust * _se[L.delta] if period==`i' . replace t_beta = beta / se_beta if period==`i' . } (2) What I tried is to kick out all non-feasible periods before starting the loop, and creating a new period2-variable that contains only those periods in which it is feasible. I tried this with the code below, but here Stata tells me that the syntax is invalid where I would like it to start the loop... . save temp1.dta, replace . sort obs_fundasset period . keep if delta!=. & L.delta!=. . duplicates drop period, force . gen period2=_n . save temp2.dta, replace . clear all . use temp1.dta . merge obs_triple using temp2, sort . summarize period2 . scalar period2_min = r(min) . scalar period2_max = r(max) . forvalues i=period2_min(1)period2_max{ . reg delta L.delta if period2==`i' . replace beta = adjust * _b[L.delta] if period2==`i' . replace se_beta = adjust * _se[L.delta] if period2==`i' . replace t_beta = beta / se_beta if period2==`i' . }

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**Follow-Ups**:**Re: st: How to loop only over the periods in which the commands are feasible, and automatically ignore the others?***From:*Stata Chris <statachris@gmail.com>

**References**:**st: How to loop only over the periods in which the commands are feasible, and automatically ignore the others?***From:*Stata Chris <statachris@gmail.com>

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