Sorry - forgot the subject on my earlier posting
Hello,
I am trying to teach myself how to use xtmixed for repeated measures anova. Using anova:
anova m method id,repeated(method)
I have a significant effect of method and I can compare the methods:
test _coef[method[1]] = _coef[method[2]] ( 1) method[1] - method[2] = 0
F( 1, 27) = 58.27
Prob > F = 0.0000
However when I use xtmixed
xi:xtmixed m i.method || id:
-----
------------------------------------------------------------------------------
m | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------
-------------+------
_Imethod_2 | -12.6 1.650589 -7.63 0.000 -15.8351 -9.364905
_Imethod_3 | -15.1 1.650589 -9.15 0.000 -18.3351 -11.8649
_Imethod_4 | -11.1 1.650589 -6.72 0.000 -14.3351 -7.864905
_cons | 38.6 2.253023 17.13 0.000 34.18416 43.01584
I can again compare all the methods:
. test _Imethod_2 = _Imethod_3
with the exception of method 1 as _Imethod_ is the "reference" in the equation.
My question is - how can I compare the effect of method 1 to the other methods or is the fact that these coefficients have a significant p value sufficient (or am I missing something that is so obvious)?
I am using Stata 10.
Thanks,
Paul
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