fert: Marital fertility nineteenth century

Description

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

Usage

data(fert)

Arguments

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.

id: Personal identification number for mother.
parity: Time order of birth interval for the present mother. The interval with parity = 0 is the first, from marriage to first birth.
age: The age of mother at start of interval.
year: The calendar year at start of interval.
next.ivl: The length of the coming time interval.
event: An indicator for whether the next.ivl ends in a new birth (event = 1) or is right censored (event = 0). Censoring occurs when the woman ends her fertility period within her first marriage (marriage dissolution or reaching the age of 48).
prev.ivl: The length of the previous time interval. May be used as explanatory variable in a Cox regression of birth intervals.
ses: Socio-economic status, a factor with levels lower, upper, farmer, and unknown.
parish: The Skelleftea region consists of three parishes, Jorn, Norsjo, and Skelleftea.

Details

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

References

https://www.umu.se/enheten-for-demografi-och-aldrandeforskning/

Examples

Run this code

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

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