flexmix (version 2.0-1)

dmft: Dental data

Description

Count data from a dental epidemiological study for evaluation of various programs for reducing caries collected among school children from an urban area of Belo Horizonte (Brazil).

Usage

data("dmft")

source

D. Boehning, E. Dietz, P. Schlattmann, L. Mendonca and U. Kirchner (1999): The zero-inflated Poisson model and the decayed, missing and filled teeth index in dental epidemiology. Journal of the Royal Statistical Society A 162(2), pages 195-209.

Details

The aim of the caries prevention study was to compare four methods to prevent dental caries. Interventions were carried out according to the following scheme: [object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Examples

data("dmft")
dmft.flx <- stepFlexmix(End ~ 1, data = dmft, k = 2,
                        model = FLXMRglmfix(family = "poisson", 
                        fixed = ~ Gender + Ethnic + Treatment))