Tony Rossini wrote:
For various reasons, I spent part of my time today looking at sample
size and power calculation tools (don't ask, don't tell...). This
seems to be one area that R is incredibly weak in (well, nearly all
stat packages, except perhaps specialized tools and SAS); sure, there
are a number of functions in various packages:
base, statmod, Hmisc
Have I missed something? (I would've expected at least one sequential
computation, or non-standard design, but apparently there are none, or
I missed it).
David Clayton has a couple of little functions on his website, one for sequential analysis IIRC. I have some on my website for genetic association (TDT and case-control) and linkage (variance components) analysis. | David Duffy (MBBS PhD) ,-_|\ | email: davidD at qimr.edu.au ph: INT+61+7+3362-0217 fax: -0101 / * | Epidemiology Unit, Queensland Institute of Medical Research \_,-._/ | 300 Herston Rd, Brisbane, Queensland 4029, Australia GPG 4D0B994A v