SireHerd: SireHerd: Milk Production from Dairy Cows

In thoree/stat340: Data and functions for BIAS at NMBU

SireHerd: Milk Production from Dairy Cows

Description

From a population of sires, three sires were chosen at random, and for each of the sires the annual milk production for three of their daughters were recorded. This data set also contains information of what herd the cows belong to.

Usage

SireHerd

Format

A data frame with 24 observations (rows) and 3 variables (columns).

	Column name	Data type	Description	Values
[,1]	milk	integer	Milk produced from each cow in kg	(6063 - 7579)
[,2]	herd	factor	The cows live in 4 different groups	(1, 2, 3, 4)
[,3]	sire	factor	The father of the cow	(1, 2, 3)

Details

• Each sire has two daughters in each herd.

• The milk production is the response variable.

• The three sires are considered random effects since it is the whole population of sires we are interested in, not specifically this random sample of three sires.

• sire and herd are nested random effects.

The sire data sets have been used in STAT210 and other courses at NMBU over several years. While this data set consists of observed milk production for 24 cows, the sires data has 40 observations. sires and SireHerd do not contain the same observations.

See Also

sires

Examples

# The structure of the object
str(SireHerd)

# One box for daughters of the same sire in each herd,
# two cows per box
boxplot(milk ~ herd + sire, data = SireHerd)

thoree/stat340 documentation built on June 30, 2024, 4:04 p.m.