alr3 (version 2.0.5)

downer: Downer data

Description

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.

Format

This data frame contains the following columns:

Calving

0 if measured before calving, 1 if after

Daysrec

Days recumbent

CK

Serum creatine phosphokinase (U/l at 30C)

AST

serum asparate amino transferase (U/l at 30C)

Urea

serum urea (mmol/l)

PCV

Packed Cell Volume (Haemactocrit),

Inflamat

inflamation 0=no, 1=yes

Myopathy

Muscle disorder, 1 if present, 0 if absent

Outcome

outcome: 1 if survived, 0 if died or killed

Source

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.

References

Weisberg, S. (2005). Applied Linear Regression, 3rd edition. New York: Wiley, Problem 12.1.

Examples

head(downer)