(1) Simple correlation coefficients

Ryx1 = 0.899 (strong, positive, direct connection) characterizes the indirect impact on biogas yield not only of the dry substance content of the agricultural crop (kg/t), but also to some extent the impact of the potential share of methane production in the agricultural crop (m3/t);

Ryx2 = 0.983 (strong, positive, direct connection) characterizes the unclean impact on biogas yield not only of the potential share of methane production from agricultural crops (m3/t), but also to some extent the impact of dry substance content in the crop (kg/t);

Rx1x2 = 0.820 (strong, positive, direct relationship) characterizes the closeness of the relationship between the factors influencing the proportion of dry substance in agricultural crops (x1) and potentially possible production of methane from the crop (x2) on the effective basis of biogas output (y).
