R help - Mar 2009 - Looking for program for sample size determination

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.


      
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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]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT