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repat
2007 Nov 28
2
fit linear regression with multiple predictor and constrained intercept
Hi group,
I have this type of data
x(predictor), y(response), factor (grouping x into many groups, with 6-20
obs/group)
I want to fit a linear regression with one common intercept. 'factor'
should only modify the slopes, not the intercept. The intercept is expected
to be >0.
If I use
y~ x + factor, I get a different intercept for each factor level, but one
slope only
if I use
y~ x *