Which type of inference is based on the mere co-existence of the middle and major term, as per the classical Indian school of logic (Nyaya)?

The inference from mere co-existence is samanyatodrsta.

It rests on an observed general correlation, not a causal link.

The middle and major terms are seen merely to occur together.

No cause-effect tie underlies the concomitance, only uniform experience.

Such non-causal, correlation-based inference is samanyatodrsta.