Quote:
Originally Posted by juan valdez
If you were referring to put skew, that's just normal
Of course (though certain stocks don't have a put skew). What I was saying is that delta is understood as an approximation to the probability of the underlying closing ITM at expiration. I say "understood" because I never data-mined this myself.
Not that financial markets follow a normal distribution, but for the sake of math, the relationship is exact if you assume a normal distribution. Here's some math I did for fun some time ago: