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Table 2 Statistical model implemented for analysis of tick counts, including approach, contemporary group effect, heteroscedasticity specification, deviance criterion information (DIC) value with respective model ranking

From: Genotype by environment interaction for tick resistance of Hereford and Braford beef cattle using reaction norm models

Mx

Two-step

CG

HET

DIC value

Ranking

M1

N/A

R

S0

4828.60

12

M2

Y

C

S0

3736.80

4

M3

Y

R

S0

4010.93

8

M4

N

R

S0

3590.84

3

M5

N/A

R

S1

4507.90

11

M6

Y

C

S1

3863.92

7

M7

Y

R

S1

4258.18

10

M8

N

R

S1

3819.11

5

M9

N/A

R

S2

4129.39

9

M10

Y

C

S2

3549.11

2

M11

Y

R

S2

3823.49

6

M12

N

R

S2

3114.77

1

  1. M x model number x; two-step (Y yes, N no, N/A non-applicable because the model is not a reaction norm model); CG specification on contemporary group effects (C covariate, R random classification effect); HET heterogeneous residual variance; S 0 homoscedastic residual variance; S 1 exponential function on heteroscedastic residual variance; S 2 discrete subclasses based on classification function on heteroscedastic residual variance