[R] Looking for program for sample size determination

[David Winsemius]

The MBESS package has many sample size functions.

Hmisc has bpower and cpower .

The pwr package has some simple power functions.

ss.fromdata.pois {package::ssanv}

asypow package

I worry that beginners in statistics will get their hands on some  
package or function that gives them a pleasing answer when the problem  
is not really the one for which that function was designed. I would  
encourage you to consider building a sufficiently complex simulation  
to adequately represent the problem at hand.

-- 
David Winsemius

On Mar 21, 2009, at 4:20 PM, Qianfeng Li wrote:

> we have some initial data from our field sampling. From the means  
> and variances, we see your sampling field is much heterogeneous (not  
> uniform).
>
> We are looking for a "R" program for sampling size determination.
>
> Right now, we are not good enough to write a whole "R" program, so  
> please help.
>
>
>
> 	[[alternative HTML version deleted]]
>
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT