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Re: st: Group-mean equality test
From
Nick Cox <[email protected]>
To
[email protected]
Subject
Re: st: Group-mean equality test
Date
Wed, 10 Aug 2011 16:32:21 +0100
Even more problematic, as the tests can not be independent.
It's difficult to think that your approach makes much sense for time
series data.
Nick
On Wed, Aug 10, 2011 at 4:21 PM, lreine ycenna <[email protected]> wrote:
> by the way, I'm meant to test the signficance for the changes in means
> from period 1 and period2, period2 and period 3..etc.
> I'm using stata11.
> Thanks in advance.
>
> On 10 August 2011 16:14, lreine ycenna <[email protected]> wrote:
>> 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/
>>
>
> *
> * 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/