Parameter

Coefficient

Robust Std. Error

t

P >

SOM

0.31

0.23

1.34

0.18

pH

1.04

0.67

1.54

0.13

Ws

−0.08

0.58

−0.13

0.90

Cl

0.31

0.18

1.66

0.10

tt

0.28

0.09

2.99

0.004^**

Intercept cohort 39

0.85

0.35

2.44

0.016^**

Intercept cohort 40

0.80

0.37

2.16

0.033^**

Intercept cohort 48

1.27

0.43

2.93

0.004^**

Intercept cohort 49

1.15

0.40

2.90

0.005^**

Intercept

−1.28

2.00

-0.64

0.525

R-sq (overall) = 0.27

F (5, 69) = 6.54 Prob > F = 0.0000

Rho = 0.44

Hausman test: chi square (5) = 14.5 Prob > chi square = 0.0125