Because causality only seems to be an obsession of "immature" science, the more successful sciences deal with acausal quantitative relationships between different variables. I'm no expert but there is tons of stuff on this if you search:

"The goal of this account of causation in science has been to reconcile two apparently incompatible circumstances. On the one hand, causes play no fundamental role in our mature science. Those sciences are not manifestly about causation and they harbor no universally valid principle of causality. On the other, the actual practice of science is thoroughly permeated with causal talk: science is often glossed as the search for causes; and poor science or superstition is condemned because of its supposed failure to conform to a vaguely specified principle of causality. I have argued that we can have causes in the world of science in same way as we can retain the caloric. There is no caloric in the world; heat is not a material substance. However in many circumstances heat behaves just as if it were a material fluid and it can be very useful to think of heat this way. It is the same with cause and effect." http://philsci-archive.pitt.edu/1214/

All I'm saying is that once you start wondering a bit about this causality idea, it is really annoying to see it thrown around like something obvious.