Hi everyone,

According to my lecture slides you can compute the Marginal Effects for continuous X for the probit model using this formula:

B1*ϕ(B0+B1X)
So for example if the question is: "How much does the predicted value of Y change if X changes from 0.1 to 0.2?"
Which value do I have to use for my X: 0.1 or 0.2? Intuitively i'd say 0.2 but I am not sure.
My tutor also says that there is a difference between the cumulative distribution function and the probability density function. But which is the difference?

I know this is more about Stata and not general statistic questions but I didn't know where else to ask and maybe you could help me.

Thank you very much in advance,

Luciano