Dear all, I have been trying to find a function to calculate the Breslow-Day test for homogeneity of the odds ratio in R. I know the test can be preformed in SAS but i was wondering if anyone could help me to perform this in r. In addition i have the fullrefman file to search for functions in the basic R packages, does anyone have any suggestions of an efficient way of searching for functions in the other add-on packages on the website? Thanks in advance Malcolm
Efficient ways of finding functions and Breslow-Day test for homogeneity of the odds ratio
6 messages · MJ Price, Social Medicine, Tim Churches, Thomas Lumley +1 more
MJ Price, Social Medicine wrote:
I have been trying to find a function to calculate the Breslow-Day test for homogeneity of the odds ratio in R. I know the test can be preformed in SAS but i was wondering if anyone could help me to perform this in r.
I don't recall seeing the Breslow-Day test anywhere in an R package, but the VCD package (available via CRAN) has a function called woolf_test() to calculate Woolf's test for homogeneity of ORs. Tim C
On Tue, 2005-10-18 at 14:27 +0100, MJ Price, Social Medicine wrote:
Dear all, I have been trying to find a function to calculate the Breslow-Day test for homogeneity of the odds ratio in R. I know the test can be preformed in SAS but i was wondering if anyone could help me to perform this in r. In addition i have the fullrefman file to search for functions in the basic R packages, does anyone have any suggestions of an efficient way of searching for functions in the other add-on packages on the website? Thanks in advance Malcolm
RSiteSearch("Breslow"), which will perform a search of the e-mail list
archives and other online documentation, reveals this post:
http://finzi.psych.upenn.edu/R/Rhelp02a/archive/50202.html
which in turn leads to this code:
http://www.math.montana.edu/~jimrc/classes/stat524/Rcode/breslowday.test.r
There is also code for the Woolf test in ?mantelhaen.test
Further searches can be conducted using help.search("Keyword"), which
will search your installed set of packages.
See ?help.search and ?RSiteSearch for more help on these.
HTH,
Marc Schwartz
On Wed, 19 Oct 2005, Tim Churches wrote:
MJ Price, Social Medicine wrote:
I have been trying to find a function to calculate the Breslow-Day test for homogeneity of the odds ratio in R. I know the test can be preformed in SAS but i was wondering if anyone could help me to perform this in r.
I don't recall seeing the Breslow-Day test anywhere in an R package, but the VCD package (available via CRAN) has a function called woolf_test() to calculate Woolf's test for homogeneity of ORs.
Both the (almost identical) meta-analysis packages also compute Woolf's test. -thomas
Marc Schwartz (via MN) wrote:
There is also code for the Woolf test in ?mantelhaen.test
Is there? How is it obtained? The documentation on mantelhaen.test in R 2.2.0 contains a note: "Currently, no inference on homogeneity of the odds ratios is performed." and a quick scan of the source code for the function didn't reveal any meantion of Woolf's test. Tim C
On Wed, 2005-10-19 at 06:47 +1000, Tim Churches wrote:
Marc Schwartz (via MN) wrote:
There is also code for the Woolf test in ?mantelhaen.test
Is there? How is it obtained? The documentation on mantelhaen.test in R 2.2.0 contains a note: "Currently, no inference on homogeneity of the odds ratios is performed." and a quick scan of the source code for the function didn't reveal any meantion of Woolf's test. Tim C
Review the code in the examples on the cited help page... :-) HTH, Marc