Where stop loss orders are a big part of my risk management approach, I'm still not quite sure what is an "optimal" value for where a stop loss order should be set
Is there any good books on risk management specifically for the derivatives crowd? Currently I use a % loss from my cost per share , but I really don't have a real scientific approach to the whole thing... Is there a formula for it like there is for early exercise? Maybe something based off the expected return? All suggestions welcome 

