From rreeve@liposcience.com  Fri Jan 31 23:00:04 2003
From: rreeve@liposcience.com (rreeve@liposcience.com)
Date: Fri Jan 31 23:00:04 2003
Subject: [Rd] summary.table parameter bug (PR#2514)
Message-ID: <200301312155.WAA01337@pubhealth.ku.dk>

summary.table has a bug in the parameter line. It currently gives 

df = (K1 - 1) * (K2 - 1) * .. * (Kp - 1)                       (1)

where Ki is the number of categories of variable i. The documentation and the expected counts say that the test is for independence among the variables (equivalent to a loglinear model [1][2]...[p]). So equation (1) is incorrect for this hypothesis, except for 2-way tables. The df line should be


parameter <- prod(sapply(m, length)) - (sum(sapply(m, length) - 1) + 1)

Running Version 1.5-0, 2002-04-28 for Windows.

Russell Reeve, Ph.D.
Dir of Experimental Design, Analysis, and Quality
rreeve@liposcience.com
(919) 256-1300



[Rd] summary.table parameter bug (PR#2514)
rreeve@liposcience.com