Downer {alr4} | R Documentation |
For unknown reasons, some dairy cows become recumbant–they lay down. This condition can be serious, and may lead to death of the cow. These data are from a study of blood samples of over 500 cows studied at the Ruakura (N.Z.) Animal Health Laboratory during 1983-84. A variety of blood tests were performed, and for many of the animals the outcome (survived, died, or animal was killed) was determined. The goal is to see if survival can be predicted from the blood measurements. Case numbers 12607 and 11630 were noted as having exceptional care—and they survived.
This data frame contains the following columns:
a factor with levels before and after
Days recumbent
Serum creatine phosphokinase (U/l at 30C)
serum asparate amino transferase (U/l at 30C)
serum urea (mmol/l)
Packed Cell Volume (Haemactocrit),
inflamation 0=no, 1=yes
Muscle disorder, a factor with levels present, and absent
a factor with levels died and survived
Clark, R. G., Henderson, H. V., Hoggard, G. K. Ellison, R. S. and Young, B. J. (1987). The abiltiy of biochemical and haematolgical tests to predict recovery in periparturient recumbent cows. NZ Veterinary Journal, 35, 126-133.
Weisberg, S. (2014). Applied Linear Regression, 4th edition. Hoboken NJ: Wiley.
head(Downer)