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From |
"Martin Weiss" <martin.weiss1@gmx.de> |

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

Subject |
st: RE: RE: AW: Compute mean for groups leaving one member out |

Date |
Fri, 23 Oct 2009 19:41:02 +0200 |

<> " But also keep track of missing values too." Very true, and an obvious omission in the rush this morning. As an economist, I often fall prey to the notion of a perfect world, market, model whatever... So here is my modified code that takes account of the missing thing. Note that I voluntarily introduce the missingness with the -drop- command in the middle of the code section... ******* clear* set obs 40 gen country=_n gen quarter=quarterly("1990:1", "YQ") expand 68 bys country: /* */ replace quarter=quarter+_n-1 format quarter %tq gen icrg=rnormal(10,100) drop if runiform()<.1 //calculate mean bys quarter: egen totalicrg= /* */ total(icrg) bys quarter: egen numobs= /* */ count(icrg) //divide by # of countries-1 gen mymean=(totalicrg-icrg)/ /* */ (numobs-1) //10 random checks... forv i=1/10{ local a= 1+int(`c(N)'*runiform()) l country quarter mymean in `a' su icrg if quarter==quarter[`a'] /* */ & country!=country[`a'] } ******* HTH Martin -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox Sent: Freitag, 23. Oktober 2009 19:31 To: statalist@hsphsun2.harvard.edu Subject: st: RE: AW: Compute mean for groups leaving one member out In words, you get 1. the total of every value but one value 2. the number of values - 1 and divide. But also keep track of missing values too. Nick n.j.cox@durham.ac.uk Martin Weiss "Could you suggest a simple way of doing this?" Taking a cue from Nick`s FAQ cited earlier: ************* clear* set obs 40 gen country=_n gen quarter=quarterly("1990:1", "YQ") expand 68 bys country: /* */ replace quarter=quarter+_n-1 format quarter %tq gen icrg=rnormal(10,100) //calculate mean bys quarter: egen totalicrg= /* */ total(icrg) //divide by # of countries-1 gen mymean=(totalicrg-icrg)/39 //10 random checks... forv i=1/10{ local a= 1+int(`c(N)'*runiform()) l country quarter mymean in `a' su icrg if quarter==quarter[`a'] /* */ & country!=country[`a'] } ************* HTH Martin -----Ursprüngliche Nachricht----- Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von kokootchke Gesendet: Freitag, 23. Oktober 2009 07:39 An: statalist Betreff: st: Compute mean for groups leaving one member out Dear all: I have a panel dataset of 40 countries at quarterly frequency from 1990:1 to 2006:4. I would like to compute the average of a variable (called icrg) for all countries in a given time period. My problem is that in doing this computation, I would like to leave one country out of the calculation. For example, in period 1990:1 for Mexico, I would like to compute the average of icrg for ALL other countries in this period EXCLUDING Mexico. Could you suggest a simple way of doing this? * * 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/ * * 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: RE: RE: AW: Compute mean for groups leaving one member out***From:*kokootchke <kokootchke@hotmail.com>

**References**:**st: Random walk simplex***From:*"Akshay Shanker" <Akshay.Shanker@standards.org.au>

**st: Compute mean for groups leaving one member out***From:*kokootchke <kokootchke@hotmail.com>

**st: AW: Compute mean for groups leaving one member out***From:*"Martin Weiss" <martin.weiss1@gmx.de>

**st: RE: AW: Compute mean for groups leaving one member out***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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