Example 3.2: weaning weights of lambs by breed and sire (part of the data)

Weaning weight (kg) of lambs of six breeds, with sex and age at weaning, for the complete offspring of a few sires per breed. The book prints only this part of the data, so the analyses of Example 3.2 run but do not reproduce the printed results.

Usage

ex32

Format

A data frame with 65 rows and 5 variables:

breed

breed: 1 to 6.

sire_id

sire (nested in breed).

sex

sex: F or M.

agew

age at weaning (days).

Ww

weaning weight.

Source

Duchateau, L., Janssen, P. and Rowlands, G. J. (1998). Linear Mixed Models. An Introduction with Applications in Veterinary Research. International Livestock Research Institute, Nairobi. Appendix A.

See also

Examp3.2

Other VetResearchLMM data: ex121, ex122, ex123, ex124, ex125, ex126, ex127, ex31, ex33

Examples

str(ex32)
#> 'data.frame':	65 obs. of  5 variables:
#>  $ breed  : int  1 1 1 1 1 1 1 1 1 1 ...
#>  $ sire_id: int  1971 1971 1971 1971 1972 1972 1972 1972 1972 1972 ...
#>  $ sex    : Factor w/ 2 levels "F","M": 1 1 1 2 1 2 1 1 2 1 ...
#>  $ agew   : int  145 140 140 122 152 151 146 139 132 131 ...
#>  $ Ww     : num  11.2 15.4 10.9 11.4 16 13.2 14.9 7.9 15.7 13.1 ...