I know this is one of those things I should just memorize and move along but I’m curious why the joint probability of survival for a couple is being calculated as the difference between the sum of the individual probabilities of survial for each spouse less the product of the individual probabilities of survival for each spouse.
Pjoint survival= (Phusband + Pwife) - (Phusband * Pwife)
Shouldn’t it just be Phusband*Pwife; since it is a joint probability of mutually exclusive events? Is it perhaps just a more conservative approach to approximating joint survival?
I was never the best statstistics student, but this one has me puzzled.
Pjoint survival= (Phusband + Pwife) - (Phusband * Pwife)
Shouldn’t it just be Phusband*Pwife; since it is a joint probability of mutually exclusive events? Is it perhaps just a more conservative approach to approximating joint survival?
I was never the best statstistics student, but this one has me puzzled.