hello, does anybody know how to figure out what propositions to use after the effective? For example is something effective in treating a disease or effective at treating a disease? Is there a general rule for using at or in?
No overall rules really; most cases are a matter of historical collocation or idiom.
I am effective at obfuscation.
Aspirin is effective in treating heart disease.
It is effective for some people only.
I think perhaps agents are effective 'at' while materials and methods are effective 'in'-- but my thoughts here have not been particularly broad.
Thank you so much for clarifying my question. I had a huanch that was the case since I have seen it used in multiple forms as you mentioned.