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From |
Nick Cox <njcoxstata@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: Looping within a subset under a certain condition |

Date |
Sat, 29 Sep 2012 02:38:24 +0100 |

Stata, not STATA. I don't understand what you are trying to do but local r = obs[`i'] if rep[`i'] == 1 local z = `i'+1 if rep[`i'] == 1 makes no sense. What you mean is perhaps if rep[`i'] == 1 { local r = obs[`i'] local z = `i'+1 } On Sat, Sep 29, 2012 at 12:31 AM, Gerard Solbrig <gsolbrig@mail.uni-mannheim.de> wrote: > This is what I have come up with so far, but for the second -forvalues- > loop, STATA tells me that "invalid syntax r(198)"! > I guess the problem lies with the local macro z, but I'm not sure. > Any troubleshooting idea? I'm not even sure if that get's me where I want to > go... > > gen rep_ins = . > gsort +firm_id -rep > by firm_id: gen obs = _n > gen group_obs = _n > sort firm_id > by firm_id (group_obs): replace group_obs = group_obs[1] > by group_obs, sort: gen group = _n == 1 > replace group = sum(group) > summarize group, meanonly > local max = r(max) > forvalues x = 1/`max' { > local N`x' = obs[_N] > } > /*how to make the counting macro for the forvalues look dynamic by firm_id > group? */ > /* works fine up to here! */ > > forvalues i = 1/`N`x'' { > local r = obs[`i'] if rep[`i'] == 1 > local z = `i'+1 if rep[`i'] == 1 > if trandate[`z'] >= wind_start[`r'] & trandate[`z'] <= > wind_end[`r'] { > replace rep_ins = 1 in [`z'] > } > else { > replace rep_ins = 0 in [`z'] > } > } > > Thanks in advance. > Best, > Gerard Solbrig > > > -----Original Message----- > From: Gerard Solbrig [mailto:gsolbrig@mail.uni-mannheim.de] > Sent: Freitag, 28. September 2012 22:45 > To: 'statalist@hsphsun2.harvard.edu' > Subject: Looping within a subset under a certain condition > > Dear Statalist-Members, > > I'm encountering a problem for which I seek your help. > > Let me start off with an example from my data (what I want it to look like > in the end), before I explain my particular problem. > > firm_id date rep wind_start wind_end > rep_ins > > firm1 01jan2000 0 . . > 0 > firm1 05apr2004 0 . . > 1 > firm1 01nov2004 1 05may2004 30may2005 > . > firm1 10dec2004 0 . . > 1 > firm1 01jan2006 0 . . > 0 > firm2 30dec1999 1 03jul1999 27jul2000 > . > firm2 05jan2000 1 09jul1999 02aug2000 > . > firm2 06jun2000 0 . . > 1 > > Each firm in my data has a 'firm_id'. Variable 'date' refers to an event > date. The 'rep' dummy indicates the type of event. > I set 'wind_start' and 'wind_end' as period around the event > (-180days,+210days), in case it's a rep = 1 type event. > > Now, I would like the 'rep_ins' dummy to indicate (i.e., rep_ins = 1), > whether the date of all other observations of this firm (where rep = 0) lies > within the range determined by 'wind_start' and 'wind_end' (which is > conditional upon the 'rep' dummy). > > I've come across looping over observations and tried to design a solution > for this problem based on that, but failed to do so. I assume the solution > also depends on sorting the data in a special way. > > Here's the first part of my .do-file: > > gen wind_start = date-180 if rep == 1 > gen wind_end = date+210 if rep == 1 > format wind_start %d > format wind_end %d > gsort +firm_id +date +trandate > gen rep_ins = 0 if rep != 1 > > I tried to come up with a solution by adding variables 'per_start' and > 'per_end' for all rep = 0: > > gen per_start = date-180 if rep == 0 > gen per_end = date+180 if rep == 0 > format per_start %d > format per_end %d > > To mark the period within which the rep = 1 event can lie. Maybe this could > contribute to finding a solution as well. > * * 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: RE: Looping within a subset under a certain condition***From:*Nick Cox <njcoxstata@gmail.com>

**References**:**st: RE: Looping within a subset under a certain condition***From:*"Gerard Solbrig" <gsolbrig@mail.uni-mannheim.de>

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