bttstudy {GLMsData}

The South African Birth to Ten (BTT) study

Description

The data record details about the Birth to Ten study (btt) in South Africa during 1990

Usage

data(bttstudy)

Format

A data frame with 8 observations on the following 4 variables.

Counts

the number of subjects in the given classification; a numeric vector

Group

the group the mother belongs to; a numeric vector with levels 1 (mothers not followed up), 2 (mothers followed up five years later)

MedicalAid

whether or not the mother had medical aid; a factor with levels No and Yes

Race

the mother's race; a factor with levels Black and White

Details

The data record details about the Birth to Ten study (btt), performed in the greater Johannesburg/Soweto metropolitan area of South Africa during 1990. In the study, all mothers of singleton births were interviewed during a seven-week period between April and June to women with permanent addresses in a defined area (a total of 4019 births). Five years later, 964 of these mothers were re-interviewed. If the mothers interviewed later and representative of the original populations, the two groups should show similar characteristics. One of those characteristics is documented here: the proportion with and without medical aid.

Source

Christopher H. Morrell (1999) Simpson's Paradox: An example from a longitudinal study in South Africa. Journal of Statistics Education, 7(3).

Examples

data(bttstudy)
summary(bttstudy)