downer: Downer data

In alr4: Data to Accompany Applied Linear Regression 4th Edition

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

a factor with levels before and 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, a factor with levels present, and absent

outcome

a factor with levels died and survived

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. (2014). Applied Linear Regression, 4th edition. Hoboken NJ: Wiley.

Examples

head(Downer)

Example output

Loading required package: car
Loading required package: effects
Loading required package: carData

Attaching package: 'carData'

The following objects are masked from 'package:car':

    Guyer, UN, Vocab

lattice theme set by effectsTheme()
See ?effectsTheme for details.
  calving daysrec    ck  ast urea pcv inflamat myopathy  outcome
1   after       1  3000  590 10.9  41       no     <NA> survived
2   after       4 12100 1240 23.8  NA     <NA>  present survived
3   after       0   600  207  8.1  31      yes     <NA>     died
4   after       1   590  113 14.6  43     <NA>     <NA>     died
5   after       2  1800  243 12.3  48     <NA>   absent     died
6  before       6   380  150   NA  28      yes   absent     died

alr4 documentation built on May 2, 2019, 6:40 p.m.