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From |
"Maarten Buis" <M.Buis@fsw.vu.nl> |

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

Subject |
st: RE: RE: RE: variable mean and r(mean), why do they differ? |

Date |
Fri, 25 Nov 2005 10:59:16 +0100 |

Use -gen double varname = r(mean)- instead of -gen varname = r(mean)-. In my example the mean of price three deviates from zero in the fourteenth decimal place, which is as close to zero as you could hope to get in a normal computer program. ----------------------------------------- Maarten L. Buis Department of Social Research Methodology Vrije Universiteit Amsterdam Boelelaan 1081 1081 HV Amsterdam The Netherlands visiting adress: Buitenveldertselaan 3 (Metropolitan), room Z214 +31 20 5986715 http://home.fsw.vu.nl/m.buis/ ----------------------------------------- -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Raoul C Reulen Sent: vrijdag 25 november 2005 10:30 To: statalist@hsphsun2.harvard.edu Subject: st: RE: RE: variable mean and r(mean), why do they differ? Thanks Maarten, In my analysis it does make a difference. I have to calculate numerous mean values, sum them to obtain one variable and then I have to multiply this by a large factor before I can use it. Any suggestions? Thanks again. Raoul -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Maarten Buis Sent: 25 November 2005 09:08 To: statalist@hsphsun2.harvard.edu Subject: st: RE: variable mean and r(mean), why do they differ? Raoul: Your hunch seems to be correct: sysuse auto, clear sum price gen price2 = price - r(mean) gen double price3 = price - r(mean) sum price2 price3 However note that the difference in the highest and lowest price is aprox. 1,200 dollar and that price2 is different from zero in only the fifth decimal place, so I would consider that zero for any practical application. HTH, Maarten ----------------------------------------- Maarten L. Buis Department of Social Research Methodology Vrije Universiteit Amsterdam Boelelaan 1081 1081 HV Amsterdam The Netherlands visiting adress: Buitenveldertselaan 3 (Metropolitan), room Z214 +31 20 5986715 http://home.fsw.vu.nl/m.buis/ ----------------------------------------- > -----Original Message----- > From: owner-statalist@hsphsun2.harvard.edu > [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Raoul C > Reulen > Sent: vrijdag 25 november 2005 9:43 > To: statalist@hsphsun2.harvard.edu > Subject: st: variable mean and r(mean), why do they differ? > > If I want to save the mean of a variable into a new variable, I would first: > sum var1 > gen var2, r(mean) > But if I subtract var1-var2, the outcome is almost, but not exactly "0". How can make sure that both means are equal? > I have tried .round, .int. , but that doesn't work. Do I have to change the storage type? Thanks for the advice. * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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