From ligges at statistik.uni-dortmund.de  Fri Sep 24 08:43:56 2004
From: ligges at statistik.uni-dortmund.de (ligges@statistik.uni-dortmund.de)
Date: Fri Sep 24 08:44:00 2004
Subject: [Rd] bug in  power.t.test( ) (PR#7245)
Message-ID: <20040924064356.DFC2410FBC@slim.kubism.ku.dk>

mai@ms.uky.edu wrote:
> Full_Name: Mai Zhou
> Version: 1.9.1
> OS: Win XP Professional
> Submission from: (NULL) (12.222.227.93)
> 
> 
> 
>>power.t.test(n=25, delta=0.1, sig.level=1.1, strict=TRUE, type="one.sample")
> 
> 
>      One-sample t test power calculation 
> 
>               n = 25
>           delta = 0.1
>              sd = 1
>       sig.level = 1.1
>           power = 1.088311
>     alternative = two.sided
> 
> ### power can never be over one!  Of course, sig.level should not take value > 1
> ### either.
> ### Possible solution: A check in the input to truncate sig.level into [0, 1]??

Well, an error (or at least warning) message seems to be more 
appropriate rather than silently changing some values, e.g. somehwere at 
the top of the functions body:

     if(any(sig.level < 0 | sig.level > 1))
         stop("sig.level must be in [0,1]")


Uwe Ligges


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[Rd] bug in power.t.test( ) (PR#7245)
ligges@statistik.uni-dortmund.de