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st: Re: fpower


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: fpower
Date   Sat, 20 Jun 2009 22:51:15 +0200

<>

Seems from the explanations at http://www.ats.ucla.edu/stat/stata/dae/fpower.htm that these values are mere educated guesses, not results of calculations...


HTH
Martin
_______________________
----- Original Message ----- From: "CHIDLOW Agnieszka" <A.Chidlow@staffs.ac.uk>
To: <statalist@hsphsun2.harvard.edu>
Sent: Saturday, June 20, 2009 10:36 PM
Subject: st: fpower


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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