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Heart Valves in Dogs on Different Exercise Regimens

Keywords: ordinal regression


Description

A new type of heart valve has been developed and is implanted in 63 dogs that have been raised on various levels of exercise. The numbers of valve transplants that succeed are recorded. Is the proportion of successful implants the same for dogs on all exercise regimens? Is there a trend with amount of exercise in the proportion of successful implants?


Variable Description

Exercise Amount of exercise: 1=None, 2=Slight, 3=Moderate, 4=Vigorous
Implant 1=Successful, 2=Unsuccessful
Frequency Number of dogs

The data could be presented in a contingency table:

 

Amount of Exercise

 

Implant

None

Slight

Moderate

Vigorous

Total

Successful

8

9

17

14

48

Unsuccessful

7

3

3

2

15

Total

15

12

20

16

63

 

Download

Data File (tab-delimited text)

Source

Zar, J. H. (1999). Biostatistical Analysis, Fourth Edition. Prentice-Hall International, Upper Saddle River, New Jersey. Exercise 24.20.

Analysis

This can be used as an example of ordinal logistic regression, with Exercise as the response and Implant as the explanatory variable.

 


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