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From |
Urmi Bhattacharya <[email protected]> |

To |
[email protected] |

Subject |
st: How to find the sum of a variable by a group id |

Date |
Tue, 2 Aug 2011 12:05:01 -0400 |

Dear Statalisters, I have the following data set. hhid childid y1 1 1 1 1 2 1 1 3 0 2 1 0 2 2 0 I need to find the sum of y1 per hhid, i.e., i need to get the following data set hhid sumy1 1 2 2 0 How do I get that? I tried the following collapse (sum) y1, by hhid it gives me the following error: option by incorrectly specified r(198); I am using Stata 11.2. It is a simple enough thing I am sure, but I am just not able to work it out. It would be great if someone could tell me where am i going wrong? Best Urmi * * 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: How to find the sum of a variable by a group id***From:*Christophe Kolodziejczyk <[email protected]>

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