chicksw: Chicken growth data.

In datana: Datasets and Functions to Accompany Analisis De Datos Con R

Chicken growth data.

Description

The body weights of the chicks were measured at birth and every second day thereafter until day 20. They were also measured on day 21. There were four groups on chicks on different protein diets.

Usage

data(chicksw)

Format

Contains four variables, as follows:

chick

An ordered factor with levels different giving a unique identifier for the chick. The ordering of the levels groups chicks on the same diet together and orders them according to their final weight (lightest to heaviest) within diet.

diet

A factor with levels 1,2,3 and 4 indicating which experimental diet the chick received.

time

A numeric vector giving the number of days since birth when the measurement was made.

weight

A numeric vector giving the body weight of the chick (gm).

Source

The data were obtained from the alr4 library.

References

Crowder M, Hand D. 1990. Analysis of Repeated Measures. Chapman and Hall

Examples

data(chicksw)    
head(chicksw) 

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