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st: Group-mean equality test


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
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