Statistical power analysis

[Dark Sandbars]

Does anyone know how to calculate the sample size required to achieve a certain level of alpha or beta (i.e., perform a power analysis)? I've been poring through stats books and using Google, but to no avail.

Pointing me to a reference book would be awesome.

Thanks,
Dark Sandbars

 

[Faebinder]

graphpad.com... get statmat and use it.

 

[116408]

I find the vanderbilt tool quite usefull:

http://biostat.mc.vanderbilt.edu/twiki/bin/view/Main/PowerSampleSize

 

[Dark Sandbars]

I find the vanderbilt tool quite usefull:

http://biostat.mc.vanderbilt.edu/twiki/bin/view/Main/PowerSampleSize

Sweet, thanks. This rocks.

 

[116408]

No problem!

For research protocols and papers there is pretty much a standard way of reporting. If you need any help pm me