Fig. 5.

Correlation matrix for the gross N rate variables with the values as compiled (left) or those imputed (right). Correlation coefficients by pairwise complete observations on each pair of variables (left) as default setting in the correlate function in R ‘dlookr’ package²⁶. The correlation coefficients are shown for the imputation results not including the observed values (e.g., the case count for GNM_imp is 105 which is the same number of missing counts as in Table 2).