Analyzing frequencies in R

Dear Manuel,

You can use the Wilson method (with Yates' 
continuity correction) to calculate CIs for 
proportion data.  It's formally described and 
advocated in the following articles:

Newcombe R.G. (1998) Two-Sided Confidence 
Intervals for the Single Proportion: Comparison 
of Seven Methods. Statistics in Medicine 17, 857?872.
Newcombe R.G. (1998) Interval Estimation for the 
Difference Between Independent Proportions: 
Comparison of Eleven Methods. Statistics in Medicine 17, 873?890.

In R, it's implemented in prop.test (which also 
allows two-sample testing of equal proportions).

Cheers,
Phil

Dear list members,

If I have 3 frequencies (3 mutually exclusive groups):

white: 19
black: 43
red: 24

How can I obtain confidence intervals for the 
proportions, instead of a P value from a chisquare test in R?
Or better, how can I assess "effect size" 
instead of finishing the analysis on a P value when analyzing frequencies in R?
Is it possible to obtain standardized Pearson residuals in this situation?
Thank you very much in advance.
Best,

Manuel Sp?nola

--
Manuel Sp?nola, Ph.D.
Instituto Internacional en Conservaci?n y Manejo de Vida Silvestre
Universidad Nacional
Apartado 1350-3000
Heredia
COSTA RICA
mspinola at una.ac.cr
mspinola10 at gamil.com
Tel?fono: (506) 2277-3598
Fax: (506) 2237-7036

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