Optical density (OD) of an ELISA for four untreated animals, measured at 11 times with two blood samples each time: a random effects model for the sources of variation (Table 1.2.6 and Appendix A of the book). New in version 2.0.0.
Format
A data frame with 88 rows and 4 variables:
- time
time point: 1 to 11.
- replicat
blood sample at the time point: 1 or 2.
- anim_id
animal: 1 to 4.
- OD
optical density.
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.
Examples
str(ex126)
#> 'data.frame': 88 obs. of 4 variables:
#> $ time : int 1 1 1 1 1 1 1 1 2 2 ...
#> $ replicat: Factor w/ 2 levels "1","2": 1 1 1 1 2 2 2 2 1 1 ...
#> $ anim_id : Factor w/ 4 levels "1","2","3","4": 1 2 3 4 1 2 3 4 1 2 ...
#> $ OD : num 0.91 0.806 0.675 0.639 0.923 0.807 0.685 0.639 0.929 0.743 ...