juul {ISwR}R Documentation

Juul's IGF data

Description

The juul data frame has 1339 rows and 6 columns. It contains a reference sample of the distribution of insulin-like growth factor (IGF-I), one observation per subject in various ages with the bulk of the data collected in connection with school physical examinations.

Format

This data frame contains the following columns:

age
a numeric vector (years).
menarche
a numeric vector. Has menarche occurred (code 1: no, 2: yes)?
sex
a numeric vector (1: boy, 2: girl).
igf1
a numeric vector. Insulin-like growth factor ($μ$g/l).
tanner
a numeric vector. Codes 1–5: Stages of puberty a.m. Tanner.
testvol
a numeric vector. Testicular volume (ml).

Source

Original data.

Examples

data(juul)
plot(igf1~age, data=juul)

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