I've searched with little success for a post which lays out the method or methods for establishing causation.

Correlation, is not the problem, rather it is establishing causation.

I know this is one of the possible abuses of conducting correlation, as well as extending the correlation of inputs and outputs outside the observed data range.

Causation seems to be a more ambiguous and slippery effort.

Any insight would be appreciated.

Regards,

Marty