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From |
Nick Cox <n.j.cox@durham.ac.uk> |

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

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

Date |
Wed, 7 Dec 2011 15:13:54 +0000 |

if "`if'"!="" { local `if' "`if' & `sample'==0" } should probably be if "`if'"!="" { local if "`if' & `sample'==0" } else local if "if `sample' == 0" where you didn't ask about the last bit, but I guess it's what you want. Nick n.j.cox@durham.ac.uk -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Tomas.Konecny@cnb.cz Sent: 07 December 2011 14:33 To: statalist@hsphsun2.harvard.edu Subject: st: How to modify the contents of the [if] qualifier in ado files? 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. * * 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/

**References**:**st: How to modify the contents of the [if] qualifier in ado files?***From:*Tomas.Konecny@cnb.cz

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