Hepatitis A serological data from Bulgaria in 1964 (aggregated)

A cross-sectional survey conducted in 1964 in Bulgaria. Samples were collected from schoolchildren and blood donors.

Usage

hav_bg_1964

Format

A data frame with 3 variables:

age

Age group

pos

Number of seropositive individuals

tot

Total number of individuals surveyed

Source

Keiding, Niels. "Age-Specific Incidence and Prevalence: A Statistical Perspective." Journal of the Royal Statistical Society. Series A (Statistics in Society) 154, no. 3 (1991): 371-412. doi:10.2307/2983150

Examples

# Reproduce Fig 4.1 (lower panel), p. 63
age <- hav_bg_1964$age
pos <- hav_bg_1964$pos
tot <- hav_bg_1964$tot
plot(
    age, pos / tot,
    pty = "s", cex = 0.08 * tot, pch = 16, xlab = "age",
    ylab = "seroprevalence", xlim = c(0, 86), ylim = c(0, 1)
)