Re: [R] Doing partial-f test for stepwise regression

2007-04-01 Thread Frank E Harrell Jr
Petr Klasterecky wrote: > And what about to read the help page ?anova ...? > > >>> > When given a sequence of objects, 'anova' tests the models against > one another in the order specified. > <<< > > Generally you almost never fit a full model (including all possible > interactions etc) -

Re: [R] Doing partial-f test for stepwise regression

2007-04-01 Thread rolf
Petr Klasterecky <[EMAIL PROTECTED]> wrote: > And what about to read the help page ?anova ...? > > >>> > When given a sequence of objects, 'anova' tests the models against > one another in the order specified. > <<< One perfectly reasonable response to ``what about'' is th

Re: [R] Doing partial-f test for stepwise regression

2007-04-01 Thread Michael Kubovy
On Apr 1, 2007, at 1:54 AM, [EMAIL PROTECTED] wrote: > Hello all, > I am trying to figure out an optimal linear model by using stepwise > regression which requires partial f-test, I did some Googling on the > Internet and realised that someone seemed to ask the question before: > > Jim Milks <[EMA

Re: [R] Doing partial-f test for stepwise regression

2007-03-31 Thread Petr Klasterecky
And what about to read the help page ?anova ...? >>> When given a sequence of objects, 'anova' tests the models against one another in the order specified. <<< Generally you almost never fit a full model (including all possible interactions etc) - no one can interpret such complicated mod

[R] Doing partial-f test for stepwise regression

2007-03-31 Thread zhuanyi
Hello all, I am trying to figure out an optimal linear model by using stepwise regression which requires partial f-test, I did some Googling on the Internet and realised that someone seemed to ask the question before: Jim Milks <[EMAIL PROTECTED]> writes: > Dear all: > > I have a regression mod