Example 3.3: breed differences in susceptibility to trypanosomosis

Packed cell volume (PCV, %) of six Boran and six N'Dama cattle measured 14 times over 35 days after a trypanosome infection: repeated measures (Example 1.2.8 and Appendix A of the book). Version 2.0.0 corrects three typing errors of version 1.1.0 against the book (two measurement days and one animal identifier).

Usage

ex33

Format

A data frame with 168 rows and 4 variables:

animal_id

animal.

breed

breed: BO (Boran) or ND (N'Dama).

time

day after infection.

PCV

packed cell volume.

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

Examp3.3

Other VetResearchLMM data: ex121, ex122, ex123, ex124, ex125, ex126, ex127, ex31, ex32

Examples

str(ex33)
#> 'data.frame':	168 obs. of  4 variables:
#>  $ animal_id: Factor w/ 12 levels "BO1","BO209",..: 1 1 1 1 1 1 1 1 1 1 ...
#>  $ breed    : Factor w/ 2 levels "BO","ND": 1 1 1 1 1 1 1 1 1 1 ...
#>  $ time     : int  0 2 4 7 9 14 17 18 21 23 ...
#>  $ PCV      : num  36.2 35.9 35.3 35.4 35.4 31.5 25.5 34.4 34.1 25.8 ...