Journal
JOURNAL OF THE ROYAL STATISTICAL SOCIETY SERIES C-APPLIED STATISTICS
Volume 62, Issue 2, Pages 233-250Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1467-9876.2012.01057.x
Keywords
Discrete response; Multinomial likelihood; Multinomial logistic regression; Penalized likelihood; Poisson likelihood
Categories
Funding
- US National Institutes of Health [MH 054693, CA 160679]
Ask authors/readers for more resources
The proportional odds logistic regression model is widely used for relating an ordinal outcome to a set of covariates. When the number of outcome categories is relatively large, the sample size is relatively small and/or certain outcome categories are rare, maximum likelihood can yield biased estimates of the regression parameters. Firth and Kosmidis proposed a procedure to remove the leading term in the asymptotic bias of the maximum likelihood estimator. Their approach is most easily implemented for univariate outcomes. We derive a bias correction that exploits the proportionality between Poisson and multinomial likelihoods for multinomial regression models. Specifically, we describe a bias correction for the proportional odds logistic regression model, based on the likelihood from a collection of independent Poisson random variables whose means are constrained to sum to 1, that is straightforward to implement. The method proposed is motivated by a study of predictors of post-operative complications in patients undergoing colon or rectal surgery.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available