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From |
n j cox <n.j.cox@durham.ac.uk> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Why can't I egen means with pweights? |

Date |
Wed, 23 Apr 2003 18:19:06 +0100 |

Laura Schechter wrote:

The answer to your title question is: because weightsI have been trying to program a specific bootstrap in stata, and need to use the weighted means of certain variables over time. Unfortunately, it seems to me that the egen command doesn't work with weights. For now, I have just been using the series of commands svymean varname [pweight=x], by(month) matrix e=e(est) generate ET=el(e,1,1) if month==1 replace ET=el(e,1,2) if month==2 etc. etc. etc. But this is really slow, and it would be so convenient if the egen command would work with weights so I could just say something like egen ET=mean(varname) [pweight=x], by(month) Does anyone know a way of doing this??

were never part of the syntax of -egen-. I don't know why.

An answer to your end question is to program it

directly. A similar problem is documented at

"I want to calculate a variable containing weighted group summary statistics, but I do not want to collapse the data and egen does not support weights. How can I do this?"

http://www.stata.com/support/faqs/data/weighted.html

In your case -levels- is presumably unnecessary if -month-

takes on values 1(1)12.

Hence

gen ET = .

qui forval i = 1/12 {

su varname [pweight=x] if month == `i', meanonly

replace ET = r(mean) if month == `i'

}

Nick

n.j.cox@durham.ac.uk

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**Follow-Ups**:**Re: st: Why can't I egen means with pweights?***From:*Laura Schechter <schechte@are.Berkeley.EDU>

**References**:**st: Why can't I egen means with pweights?***From:*Laura Schechter <schechte@are.Berkeley.EDU>

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