juul function

Juul's IGF data

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.

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)