Dear Helpers,

My question is about a certain application of geostatistical approaches in Hydrogeology.
I have an index which is DRASTIC (groundwater vulnerability index) and is a summation of seven parameters D, R, A, S, T, I, and C. There are hydrogeological parameters which are classified over the study area.

The question is: How could I assess the significance important of the change of one of these parameters on the change of the whole index (DRASTIC). I mean how could I say that DRASTIC will change dramatically according to the change in D or A (for example).

Thanks