eha (version 2.4-4)

fert: Marital fertility nineteenth century

Description

Birth intervals for married women with at least one birth, 19th northern Sweden

Usage

data(fert)

Format

A data frame with 12169 observations the lengths (in years) of birth intervals for 1859 married women with at least one birth. The first interval (parity = 0) is the interval from marriage to first birth.

Source

Data is coming from The Demographic Data Base, Umea University, Umea, Sweden.

Details

The data set contain clusters of dependent observations defined by mother's id.

References

http://www.ddb.umu.se

Examples

data(fert)
fit <- coxreg(Surv(next.ivl, event) ~ ses + prev.ivl, data = fert, subset =
(parity == 1))
drop1(fit, test = "Chisq")