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Table 2 Survival table for Icelandic riding horses, distributed by age and RS.

From: Culling Rate of Icelandic Horses due to Bone Spavin

 

Without RS

With RS

Age k

n k

Censored c k

Withdrawn w k

Culling d k

Rate of culling ĥ

Survival function Ŝ

n k

Censored c k

Withdrawn w k

Culling d k

Rate of culling ĥ

Survival function Ŝ

6

357

0

0

0

0.000

1.000

151

0

0

0

0.000

1.000

7

357

3

3

2

0.006

0.994

151

1

1

2

0.013

0.987

8

352

19

19

3

0.009

0.986

148

2

2

2

0.014

0.973

9

330

37

37

2

0.006

0.979

144

6

6

6

0.043

0.932

10

291

25

25

8

0.029

0.951

132

7

7

1

0.008

0.925

11

258

57

11

8

0.032

0.921

124

14

7

7

0.058

0.871

12

193

57

14

4

0.022

0.901

103

16

0

8

0.078

0.803

13

132

49

8

2

0.016

0.887

79

18

3

14

0.181

0.668

14

81

25

3

7

0.088

0.809

47

10

4

6

0.133

0.570

15

49

18

0

6

0.122

0.710

31

12

0

2

0.065

0.534

16

25

13

1

4

0.163

0.594

17

11

0

3

0.176

0.439

17

8

7

0

1

0.125

0.520

3

3

0

0

0.000

0.439

Total

 

310

121

47

   

100

30

51

  
  1. RS: radiographic sign of bone spavin
  2. Culling: not used for riding anymore
  3. Withdrawn: horses that were sold or selected for breeding
  4. Censored: Withdrawn + horses still in use after 5 years