Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
From | lreine ycenna <lreine.ycenna@gmail.com> |
To | statalist@hsphsun2.harvard.edu |
Subject | st: Group-mean equality test |
Date | Wed, 10 Aug 2011 16:14:51 +0100 |
Hi All, I am looking for an easier way to calculate the mean values for each of my variables for different time horizons (e.g. variable x from 1985-1990, 1991-1996..etc) and at the same time test the signficance (t-stats) for the changes between the means for these periods within each variable itself. I manage to go from egen meanedu= mean(edu) if year < 1991 & year > 1979 & country==GBR. and the same for the next 5 year period..etc. Though this only gives me the mean values for the time periods wanted, how do I then test the significance for the changes using ttest? year code edu 1973 GBR 0.6096253 1974 GBR 0.5443353 1975 GBR 0.5181908 1976 GBR 0.3762168 1977 GBR 0.5183734 1978 GBR 0.3920778 1979 GBR 0.4526944 1980 GBR 0.4694474 1981 GBR 0.3979259 1982 GBR 0.3916153 1983 GBR 0.2517771 1984 GBR 0.2545344 1985 GBR 0.2207009 1986 GBR 0.1595718 1987 GBR 0.30558 1988 GBR 0.2499627 1989 GBR 0.4576487 1990 GBR 0.5781643 1991 GBR 0.5855764 1992 GBR 0.4679879 1993 GBR 0.3789743 1994 GBR 0.6381156 1995 GBR 0.6055152 1996 GBR 0.4644643 1997 GBR 0.195214 1998 GBR 0.2751569 1999 GBR 0.4539562 2000 GBR 0.46502 * * 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/