Dear Statausers,
I'm doing a simple ttest, however I would like to retrive the Std. Deviation
of the difference of the means (see output below). Does anyone know if Stata
saves this statistic?
Many thanks,
JP
. ttest match2291_0== match2291_1 if week>=2144
Paired t test
----------------------------------------------------------------------------
--
Variable | Obs Mean Std. Err. Std. Dev. [95% Conf.
Interval]
---------+------------------------------------------------------------------
--
matc~1_0 | 127 76.95678 .9025185 10.17087 75.17072
78.74284
matc~1_1 | 127 59.05176 .9798913 11.04281 57.11258
60.99093
---------+------------------------------------------------------------------
--
diff | 127 17.90502 .2387616 2.690706 17.43252
18.37753
----------------------------------------------------------------------------
--
Ho: mean(match2291_0 - match2291_1) = mean(diff) = 0
Ha: mean(diff) < 0 Ha: mean(diff) != 0 Ha: mean(diff) > 0
t = 74.9912 t = 74.9912 t = 74.9912
P < t = 1.0000 P > |t| = 0.0000 P > t = 0.0000
r; t=0.18 12:41:07
. return list
scalars:
r(sd_2) = 11.0428143208466
r(sd_1) = 10.17086703109571
r(se) = .2387615526929942
r(p_u) = 1.0480080349e-106
r(p_l) = 1
r(p) = 2.0960160698e-106
r(t) = 74.99123715134762
r(df_t) = 126
r(mu_2) = 59.05175589013287
r(N_2) = 127
r(mu_1) = 76.95678011075718
r(N_1) = 127
----------------------------------------
Joao Pedro W. de Azevedo
School of Business (Economics)
Ridley Building
University of Newcastle
NE1 7RU
United Kingdom
Telephone: +44 (0) 191 222-5237
Mobile: +44 (0) 7984-060675
Fax: +44 (0) 191 222-6548
E-mail: [email protected]
http://www.students.ncl.ac.uk/j.p.azevedo/
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