Starting Values for a non-linear regression

Hi I am trying to get the starting values for non-linear regression of a data set that follows a weibull function. I tried to do the OLS regression of this equation:

log(log(1-F(t)))=-Beta(log(lambda))-Beta(log(t)) to get the starting values.

The only problem is that F(t) is greater than 1 which leads taking a log of a negative values (not possible.) Anyother suggestions on getting these starting values.


Ambassador to the humans
Can you provide more info on what you're doing? If F(t) is what it normally stands for then it can't be greater than 1.