secher {ISwR}R Documentation

Birth weight and ultrasonography

Description

The secher data frame has 107 rows and 4 columns. It contains ultrasonographic measurements of fetuses immediately before birth and subsequent birth weight.

Format

This data frame contains the following columns:

bwt
a numeric vector. Birth weight (g).
bpd
a numeric vector. Biparietal diameter (mm).
ad
a numeric vector. Abdominal diameter (mm).
no
a numeric vector. Observation number.

Source

D. Kronborg and L.T. Skovgaard (1990), Regressionsanalyse, Table~3.1, FADLs Forlag (in Danish).

Secher et al. (1987), Eur.j.obs.gyn.repr.biol., 24, 1–11.

Examples

data(secher)
plot(bwt~ad, data=secher, log="xy")

[Package ISwR version 1.0-6 Index]