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st: lfit 2 lines with different slopes but same intercept in cmogram?
From
Jen Zhen <[email protected]>
To
[email protected]
Subject
st: lfit 2 lines with different slopes but same intercept in cmogram?
Date
Thu, 6 Mar 2014 17:07:27 +0100
Dear list members,
I use Chris Roberts' cmogram to
-cmogram y x, scatter cutpoint(50) lineat(50) lfit histopts(bin(20)) -
to construct a scatterplot and to fit separate lines on each side of a
cutoff value.
Now I'd like to allow the 2 lines to have different slopes, but I want
them to have the same intercept, i.e. I want to impose that there is
no jump between the the two lines at x=50.
I presume this has to be done through lfitopts() but I don't know how.
Any clues?
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