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st: fpower


From   "CHIDLOW Agnieszka" <A.Chidlow@staffs.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: fpower
Date   Sat, 20 Jun 2009 21:36:38 +0100

Dear Statalisters,
 
Please forgive me if you find this request silly (or basic), but I have been having some nightmares to figure out how to use ex post "fpower" for anova.
I have read about the power analysis  (e.g. papers, and on www.ats.ucla.edu), but it looks like I can't do the test because I don't seem to know how to calculate delta and/or means for my groups. Hence would really appreciate some help from you.
 
My anova results are: 
 
.anova nm year
                            Number of obs =      95     R-squared     =  0.0497
                            Root MSE      = .487822     Adj R-squared = -0.0387
                  Source |  Partial SS    df       MS           F     Prob > F
              -----------+----------------------------------------------------
                   Model |  1.07136314     8  .133920392       0.56     0.8055
                         |
                    year |  1.07136314     8  .133920392       0.56     0.8055
                         |
                Residual |   20.465479    86  .237970686   
              -----------+----------------------------------------------------
                   Total |  21.5368421    94  .229115342   
 
where: nm = 2 groups
       year = 8 groups
 
Many thanks in advance,
Aggie 


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