Message-ID: <419BBD0E.4020502@web.de>
Date: 2004-11-17T21:05:18Z
From: Thomas Friedrichsmeier
Subject: Power sampling
Hello,
after a unsuccessful search in lists maliarchive I wonder how I could
estimate the power of a sample size related to an unknown population.
Given the following (fake))situation:
I do have a database containing about 5 millions observations over 70
variables.
I would like to compute (as epidemiologists are used to) the required
size of a sample to do some test on a test sample (test data), later
doing some subsequent analysis of a new sample to build a prediction
model.
Help facilities of R show some entries regarding power, but none of
them seemed to be appropriate for my purpose (maybe I am wrong, but
sometimes I have some difficulties to decipher the message of those
tiny hints for available packages)
I would appreciate somebody effort to point me to the right
package/function to archieve this task!
regards
Thomas