[ADMB Users] conditional statement using parameter to be estimated

[dave fournier]

The way to do this is to use a differentiable logistic as Ben suggested. In
addition you should use phases and gradually
increase the steepness.  Finally as a technical matter you should use
exp(z) in place of exp(-z) to avoid overflow when
necessary.  See the attached changepoint.tpl

To run this with multiple phase you would use the command line option
-maxph 3

Note use of value() function which will be needed in random effects model.
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