Hookworm 1993 {epicalc} | R Documentation |
A dataset from a cross-sectional survey in 1993 examining hookworm infection
data(HW93)
A data frame with 637 observations on the following 6 variables.
id
a numeric vector for personal identification number
epg
a numeric vector for eggs per gram of faeces
age
a numeric vector for age in years
shoes
a factor for shoe wearing with levels no
yes
intense
a factor for intensity of infection in epg. with levels 0
1-1,999
2,000+
agegr
a factor for age group with levels <15 yrs
15-59 yrs
60+ yrs
library(MASS) data(HW93) use(HW93) intense.ord <- ordered(intense) ord.hw <- polr(intense.ord ~ agegr + shoes) summary(ord.hw)