Description

Data from a survey of HIV-positivity of a cohort of Danish men followed by regular tests from 1983 to 1989.

Usage

Format

A data frame with 297 observations on the following 7 variables.

id

ID of the person

entry

Date of entry to the study. Date variable.

well

Date last seen seronegative. Date variable.

ill

Date first seen seroconverted. Date variable.

bth

Year of birth minus 1950.

pyr

Annual number of sexual partners.

us

Indicator of wheter the person has visited the USA.

Source

Mads Melbye, Statens Seruminstitut.

References

Becker N.G. and Melbye M.: Use of a log-linear model to compute the empirical survival curve from interval-censored data, with application to data on tests for HIV-positivity, Australian Journal of Statistics, 33, 125–133, 1990.

Melbye M., Biggar R.J., Ebbesen P., Sarngadharan M.G., Weiss S.H., Gallo R.C. and Blattner W.A.: Seroepidemiology of HTLV-III antibody in Danish homosexual men: prevalence, transmission and disease outcome. British Medical Journal, 289, 573–575, 1984.

Examples