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From |
Tomas.Konecny@cnb.cz |

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

Subject |
st: How to modify the contents of the [if] qualifier in ado files? |

Date |
Wed, 7 Dec 2011 14:32:39 +0000 |

Hi, I would like to write a short program that would reestimate a given regression with a smaller number of observations, where the number of observations to be removed can be determined by a `frc' option. For now it looks like this: program test, nclass version 9.2 syntax anything [if] [in], frc(string) reg `anything' `if' `in' *mark the sample from previous regression tempname sample g `sample'=1 if e(sample) *mark observations from the end of the e(sample) that I want to exclude from the next estimation replace `sample'=0 if `sample'[_n+1]==. & `sample'[_n-1]==1 & "`frc'"!="" local i=2 while `i'<=`frc' { replace `sample'=0 if `sample'[_n+1]==0 local i=`i'+1 } *NOW HERE IS THE ACTUAL PROBLEM, I would like to have the `sample' selection criteria compatible with other possible [if] constraints, *that is, I would like the program to run also cases like if "`if'"!="" { local `if' "`if' & `sample'==0" } reg `anything' `if' `in' end For example -> reg pd unempl if time>tq(1994q1), frc(2) The if "`if'"!="" {.... part onwards, however, does not work. Thank you very much for any advice, Tomas Czech National Bank * * 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: How to modify the contents of the [if] qualifier in ado files?***From:*Maarten Buis <maartenlbuis@gmail.com>

**st: RE: How to modify the contents of the [if] qualifier in ado files?***From:*Nick Cox <n.j.cox@durham.ac.uk>

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