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From |
"Jens Kruk" <[email protected]> |

To |
[email protected] |

Subject |
Re: st: Relative Comparision between Observations |

Date |
Thu, 25 Aug 2011 15:55:07 +0200 |

Hi Nick, lets say the data looks like this: id____isspread____start____end____transaction 1_____1___________3________6______. 2_____0___________.________.______5 3_____1___________2________5______. 4_____0___________.________.______5.5 now what I want Stata to do is to tell me (for example by creating additional variables that contain the ids) that ids 2 and 4 occured between start and end date of observation 1 (5 and 5.5 are between 3 and 6) and that id 2 occured between the start and end date of spread 3 (5 is weakly between 2 and 5). A perfect result of the procedure would look like this: id____isspread____start____end____transaction____tr1___tr2 1_____1___________3________6______.______________2_____4__ 2_____0___________.________.______5______________._____.__ 3_____1___________2________5______.______________2_____.__ 4_____0___________.________.______5.5____________._____.__ Best, Jens -------- Original-Nachricht -------- > Datum: Thu, 25 Aug 2011 14:22:19 +0100 > Von: Nick Cox <[email protected]> > An: [email protected] > Betreff: Re: st: Relative Comparision between Observations > Please show a representative chunk of your data so that precisely what > are your variables and your observations becomes clear. > > Nick > > On Thu, Aug 25, 2011 at 2:09 PM, <[email protected]> wrote: > > > I want to perform the following task for a very large dataset (so > writing a Mata loop is probably not the solution): the dataset consists of two > sorts of data: spreads and transactions. Spreads do have a start and an end > date, while transactions only have a transaction date. Now I want to know > whether some transaction happend between the start and end date of a spread. > Ideally, I would like to have variables containing all the ids of > transactions that occured between the start and end data of the spread for each > spread. Is there a way to use inexact matching or merging for this ? > > This should be a familiar problem, however, I do not have a clue how to > solve it. > > * > * 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/ -- NEU: FreePhone - 0ct/min Handyspartarif mit Geld-zurück-Garantie! Jetzt informieren: http://www.gmx.net/de/go/freephone * * 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: Relative Comparision between Observations***From:*Nick Cox <[email protected]>

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