Re: [R] statistics - hypothesis testing question

2007-09-14 Thread Pfaff, Bernhard Dr.
Hello Mark, in addition and complementing the already provided answers to your question. You want to consider the J-test, too. For an outline and the pitfalls of this test, see: http://citeseer.ist.psu.edu/cache/papers/cs/24954/http:zSzzSzwww.econ.qu eensu.cazSzfacultyzSzdavidsonzSzbj4-noam.pdf/b

Re: [R] statistics - hypothesis testing question

2007-09-13 Thread S Ellison
I may be miles off base, but could this be treated as a random-effects model, with the regression predictors as random effects grouped by week? And if so, could each set form a single lme() model, allowing you to compare the models via AIC's for 'quality' and anova for significance of the differ

Re: [R] statistics - hypothesis testing question

2007-09-13 Thread Charles C. Berry
-Original Message- > From: Duncan Murdoch [mailto:[EMAIL PROTECTED] > Sent: Thursday, September 13, 2007 2:32 PM > To: Leeds, Mark (IED) > Cc: [EMAIL PROTECTED] > Subject: Re: [R] statistics - hypothesis testing question > > On 9/13/2007 2:18 PM, Leeds, Mark (IED) wrote: &

Re: [R] statistics - hypothesis testing question

2007-09-13 Thread John Sorkin
Mark, Estimates of R values can be compared using Fishers r to z transform. Perhaps this will do what you wish to do. John John Sorkin M.D., Ph.D. Chief, Biostatistics and Informatics Baltimore VA Medical Center GRECC, University of Maryland School of Medicine Claude D. Pepper OAIC, University of

Re: [R] statistics - hypothesis testing question

2007-09-13 Thread Greg Snow
iginal Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Leeds, Mark (IED) > Sent: Thursday, September 13, 2007 12:18 PM > To: [EMAIL PROTECTED] > Subject: [R] statistics - hypothesis testing question > > I estimate two competing simple regression m

Re: [R] statistics - hypothesis testing question

2007-09-13 Thread Leeds, Mark (IED)
: [EMAIL PROTECTED] Subject: Re: [R] statistics - hypothesis testing question On 9/13/2007 2:18 PM, Leeds, Mark (IED) wrote: > I estimate two competing simple regression models, A and B where the > LHS is the same in both cases but the predictor is different ( I > handle the intercept is

Re: [R] statistics - hypothesis testing question

2007-09-13 Thread Duncan Murdoch
On 9/13/2007 2:18 PM, Leeds, Mark (IED) wrote: > I estimate two competing simple regression models, A and B where the LHS > is the same in both cases but the predictor is different ( > I handle the intercept issue based on other postings I have seen ). I > estimate the two models on a weekly basis

[R] statistics - hypothesis testing question

2007-09-13 Thread Leeds, Mark (IED)
I estimate two competing simple regression models, A and B where the LHS is the same in both cases but the predictor is different ( I handle the intercept issue based on other postings I have seen ). I estimate the two models on a weekly basis over 24 weeks. So, I end up with 24 RSquaredAs and 24