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| From | Kieran McCaul <kieran.mccaul@uwa.edu.au> |
| To | "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |
| Subject | st: RE: significance of differences |
| Date | Fri, 1 Jun 2012 14:48:33 +0800 |
... I don't understand this. What null hypothesis are you testing? That the mean in the first fifth equals the mean in the last fifth? If you split a variable AT the quintiles then the mean in the first fifth will be different from the mean in the last fifth by definition, won't it. -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of "Fabian Schönenberger" Sent: Friday, 1 June 2012 2:27 PM To: statalist@hsphsun2.harvard.edu Subject: st: significance of differences Dear Statalist I want to compare if the difference of a specific variable between the first and fifth quintile is significant. I tried ttest with if; ttest var if varquintile==1 == var if varquintile==5 However, this does not work. Any suggestions? Many thanks in advance, Fabian -- NEU: FreePhone 3-fach-Flat mit kostenlosem Smartphone! Jetzt informieren: http://mobile.1und1.de/?ac=OM.PW.PW003K20328T7073a * * 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/