The assumptions of Probit analysis are the assumption of normality and the assumption for linear regression.

you can use analyze <regression <probit

If your dependent variable is dummy coded (binary) then you must use a logistic regression for you analysis. There are two types; logit and probit. Both types return very similar results and your decision on which to use is based on personal preference and discipline standards. Economics and marketing tend to use probit while sociology tends to use logit.

Dear readers,

You can use the survival analysis with Kaplan-Meier method to estimate the median lethal time using SAS or SPSS statistical packages. Someone would think to use Probit instead of Survival Analysis, but it is not recommended when you have not independent replicates (ex.: insects). Probit exerts that replicates are independent in time.

Cheers,

Gabriel.