Materials and methods
Data
The dataset used in this paper was derived from a hydrochemical study in
Po Plain Italy (Conti et al. 2000). Our data re-use proposal was granted
by the principal investigator via several emails. The data was chosen
because we believe the hydrochemical values are similar with the
occuring system in Indonesia. We have gathered 90 samples with 14
variables on each samples consists of: 11 samples of formation water and
79 samples of groundwater (Table 1 and Table 2). We have calculated the
regression coefficients, presented as correlation table in the
supplementary data table.
1 Variable description