Epi (version 2.19)

Y.dk: Population risk time in Denmark

Description

Risk time (person-years) in the Danish population, classified by sex, age, period and date of birth in 1-year classes. This corresponds to triangles in a Lexis diagram.

Usage

data(Y.dk)

Format

A data frame with 13860 observations on the following 6 variables.

sex

Sex. 1:males, 2:females

A

One-year age class

P

Period

C

Birth cohort

Y

Person-years

upper

Indicator of upper triangle in the Lexis diagram

Details

The risk time is computed from the population size figures in N.dk, using the formulae devised in B. Carstensen: "Demography and epidemiology: Age-Period-Cohort models in the computer age", http://biostat.ku.dk/reports/2006/ResearchReport06-1.pdf/, later published as: B. Carstensen: Age-period-cohort models for the Lexis diagram. Statistics in Medicine, 10; 26(15):3018-45, 2007.

Examples

# NOT RUN {
data(Y.dk)
str(Y.dk)
# Compute mean age, period for the triangles
attach( Y.dk )
age <- A + (1+upper)/3
per <- P + (2-upper)/3
# Plot a Lexis diagram
library( Epi )
Lexis.diagram( age=c(0,10), date=c(1990,2000), coh.grid=TRUE, int=1 )
box()
# Print the person-years for males there
text( per[sex==1], age[sex==1],
      formatC( Y[sex==1]/1000, format="f", digits=1 ) )
# }