I'm interested in knowing how you do your correlation calculations, if there are any criteria for them (such as if a correlation is weighted against if the indu

I'm interested in knowing how you do your correlation calculations, if there are any criteria for them (such as if a correlation is weighted against if the industries are unrelated). Also interested in your information feeds. I'm not looking to compete or do it for myself, this field just draws my playful interest and I'm curious.