Statistical modelling /Concentrates and milk yield
We also carried out a number of multiple regression analyses Stats → Regression analysis →
Generalized linear models … with 'conc2' combined with 'conc3', 'conc4' and 'conc5' in turn.
By comparing the regression coefficients for 'conc2' with the coefficients for the other
variables it can be seen that the concentration fed in Phase 2 between weeks 7 and 14 had
as strong an influence on subsequent milk yields as the concentrate fed at the time.
|
Dependent variable
|
Regression coefficients
|
Correlation coefficient
|
|
milk3
|
1.78 ± 0.21 conc3
|
0.69
|
|
milk3
|
1.03 ± 0.26 conc3 +1.06 ± 0.25 conc2
|
0.76
|
|
milk4
|
1.16 ± 0.21 conc4
|
0.54
|
|
milk4
|
0.58 ± 0.21 conc4 + 1.17 ± 0.23 conc2
|
0.69
|
|
milk5
|
1.41 ± 0.21 conc5
|
0.64
|
|
milk5
|
0.98 ± 0.25 conc5 + 0.83 ± 0.27 conc2
|
0.70
|
|
