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From |
abiswas@clarku.edu |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: Reshape, Duplicate Observations |

Date |
Fri, 21 Aug 2009 20:05:30 -0400 (EDT) |

I have a dataset with multiple observations (both unique and duplicate) for each identifier HID. Here is an example Table 1 HID DATE FD 1. A 01/03/2005 0 2. A 04/05/2006 1 3. B 02/03/1999 0 4. B 09/07/2004 1 5. B 09/07/2004 0 6. C 05/02/2004 0 7. C 03/11/2004 1 8. D 05/08/1998 0 I have another dataset (already reshaped widely) as follows Table 2 HID NID1 DIST1 NID2 DIST2 1. A B .75 C .25 2. B D .35 A .75 3. C E .65 A .25 4. D B .35 . Now, I want to gather information by HID on a set of other variables DATE and FD so that each observation in Table 2 contains information on HID DATE NID* and their corresponding dates, DIST* and FD*. I am not allowed to drop the duplicate observation (obs. 4 & 5) since each of them contains important information. The outcome table that I am looking for is as follows Table 3 HID DATE FD NID1 DIST1 DATE1 DATE2 DATE3 FD1 FD2 FD3 NID2 DIST2 DATE* FD* 1. A 01/03/05 0 B .75 02/03/99 09/07/04 09/07/04 0 1 0 C .25 2. A 04/05/06 1 B .75 02/03/99 09/07/04 09/07/04 0 1 0 C .25 3. B 02/03/99 0 D 4. B 09/07/04 1 D 5. B 09/07/04 0 D 6. C 05/02/04 0 E 7. C 03/11/04 1 E 8. D 05/08/98 0 B Basically, my plan is to know for each group (obs.) of HID and DATE the corresponding NIDS which are within a year from the DATE and their corresponding total number of FDs. That?s why I think I need to go through Table 3. Thanks in advance. * * 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: Reshape, Duplicate Observations***From:*Tirthankar Chakravarty <tirthankar.chakravarty@gmail.com>

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