Table 5 Fitted models for environmental covariates and maize grain Zn concentration in Malawi.

From: Soil and landscape factors influence geospatial variation in maize grain zinc concentration in Malawi

Predictand

 

Predictor and Coefficient

\(R\)2adj

\(R\)2adj,c

κ κ

τ2

σ2

ϕ

*β0

β1

β2

Maize Zn

  

Easting

Mean Annual Temperature

      
 

Null model

9.884

0.019

   

1.0

14.995

3.277

21.123

  

 − 0.222

0.010

0.073

0.093

0.523

1.0

15.008

1.564

15.592

  1. *β0–β4, fixed effects coefficients β0 is a constant and βi is the coefficient for the ith random effect; R2adj, the difference between the sum of the variances of the random effects for the null model and the proposed model expressed as a proportion of the sum for the null model; R2adj,c, the difference between the variance of the correlated random effect (σ2) for the null model and the proposed model expressed as a proportion of that variance for the null model; κ, smoothness parameter of the Matérn correlation function; τ2, variance of the iid random effect (nugget variance); σ2, variance of the correlated random effect; ϕ, distance parameter of the Matérn correlation function.
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