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Subject: Re: How to plot 2 fitting lines in 1 dataset?
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To John,
Yes, I think I probably can plot an exponential line to separate this dataset into two groups (an exponential between these two groups). What exactly should I do?

Thx,
Michael 

> Do you know where the break occurs? 
 
> If you do, then split this into two problems. In
> fact they can be solved in one estimation step.
> 
> If not then you need to use a tool that can find the
> location of the break. This is sometimes known as a
> free knot spline, here a piecewise linear spline. Either
> problem can be solved easily enough, but the solution
> depends on your answer.
> 
> So, do you know the location of the break or must
> it be estimated?
> 
> John