I am trying to decide how to get my starting parameters optimized for a simple exponential decay model. My regression formula is:

y ~ Be^(at)

Where y is the remaining value at time,t, remaining after decay, B0 is initial value, a is the decay and t is time.

Is a self starting function like R's SSasym appropriate? I've eyeballed initial starting values and also used this function and the results are significant different.


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