Re: [R] Ordinal regression with some categories combined for some data

2016-01-17 Thread Bob O'Hara
t; Armidale NSW 2351 > Email: home: mac...@northnet.com.au > > > > -Original Message- > From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Bob O'Hara > Sent: Saturday, 16 January 2016 01:49 > To: r-help > Subject: [R] Ordinal regression with some

Re: [R] Ordinal regression with some categories combined for some data

2016-01-17 Thread Frank Harrell
This does seem to be a good situation for ordinal regression. The R rms package's orm function allows for thousands of categories in Y. But it doesn't handle censoring. This discussion would be better for stats.stackexchange.com Frank -- ---

Re: [R] Ordinal regression with some categories combined for some data

2016-01-16 Thread Duncan Mackay
O'Hara Sent: Saturday, 16 January 2016 01:49 To: r-help Subject: [R] Ordinal regression with some categories combined for some data Hi! I've been asked about a problem where I think I can see how to write the model, but don't know if it's been implemented in R. It's not some

Re: [R] Ordinal regression with some categories combined for some data

2016-01-16 Thread Thierry Onkelinx
Dear Bob, I don't know any package that handles ordinal data the way you are looking for. I'd just would comment on the ordinal regression. Would the time of loss be the ordinal response? That seems inefficient to me when you have a lot of time points (= lots of ordinal classes). IMHO the survival

[R] Ordinal regression with some categories combined for some data

2016-01-15 Thread Bob O'Hara
Hi! I've been asked about a problem where I think I can see how to write the model, but don't know if it's been implemented in R. It's not something I work on a lot, so I'm hoping someone else can point me to an answer straight away. The researcher has been carrying out germination experiments: l