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From |
"Gerard Solbrig" <gsolbrig@mail.uni-mannheim.de> |

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

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

Date |
Sat, 29 Sep 2012 01:31:15 +0200 |

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. All input is welcome. Thanks in advance. Best, Gerard Solbrig * * 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>

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