R: Juul's IGF data

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.

### Usage

    juul

### 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 (microgram per liter).

`tanner`

  a numeric vector, codes 1–5: Stages of puberty ad modum Tanner.

`testvol`

  a numeric vector, testicular volume (ml).

### Source

Original data.

### Examples

    plot(igf1~age, data=juul)

[Package ISwR version 2.0-7 Index]