Re: [R] Joint test

2009-02-06 Thread Hein Goemans
Goemans Sent: February-06-09 3:30 PM To: r-h...@stat.math.ethz.ch Subject: [R] Joint test Dear All, I am estimating a Cox proportional hazard model, with several interactions of the type a*z + a*y + a*x + b*z + b*y + b*x. I need to know if the first three (the "a"s) are jointly significantly differe

Re: [R] Joint test

2009-02-06 Thread John Fox
elp-boun...@r-project.org] On > Behalf Of Hein Goemans > Sent: February-06-09 3:30 PM > To: r-h...@stat.math.ethz.ch > Subject: [R] Joint test > > Dear All, > > I am estimating a Cox proportional hazard model, with several interactions > of the type a*z + a*y + a*x + b*

[R] Joint test

2009-02-06 Thread Hein Goemans
Dear All, I am estimating a Cox proportional hazard model, with several interactions of the type a*z + a*y + a*x + b*z + b*y + b*x. I need to know if the first three (the "a"s) are jointly significantly different from the last three (the "b"s). I have tried several approaches, but have been

[R] Joint test

2009-02-06 Thread Hein Goemans
Dear All, I am estimating a Cox proportional hazard model, with several interactions of the type a*z + a*y + a*x + b*z + b*y + b*x. I need to know if the first three (the "a"s) are jointly significantly different from the last three (the "b"s). I have tried several approaches, but have been