R devel - Jan 2003 - summary.table parameter bug (PR#2514)

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

On Fri, 31 Jan 2003 rreeve@liposcience.com wrote:
> 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.
So that's 4 versions old already. I don't know if this has changed (you
don't make it easy for us by providing an example), but I do know that
around 170 bugs have been fixed, so please update.

We do expect people to test the latest version before filing a bug report.
It takes you less time that it takes the volunteers to process the report.

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595