A parametric model for ordinal response data, with application to estimating age-specific reference intervals.
A model for ordinal response data based on an underlying (but unobserved) Normal distribution is proposed. The model is particularly useful for highly discrete data with a large proportion of zero values. It is applied to the estimation of age-specific reference intervals in two substantive example datasets.
Royston
P
P
MRC Clinical Trials Unit, London, UK. patrick.royston@ctu.mrc.ac.uk