Question

Possible Duplicate:
Finding where two linear fits intersect in R

Given some points on a graph (usually only about 6 or 7 points), I need to find a best fit solution where the solution consists of the following:

1. Two linear lines
2. The lines must intersect
3. The intersection point (the x point) must lie between two values I specify (such as xLow and xHigh)

How would I do this using nls (or something better?)?

If there are multiple best fits, then any of them are fine. Basically, the two lines form a V.

Answer 1

Generally if you first do a fit of y on x and then x on y the lines will cross within the data at their joint means and they are both least squares fits, albeit to different data situations.