Displaying 2 results from an estimated 2 matches for "repwt".
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rept
2009 Mar 05
1
hatvalues?
...help in understanding the theory. First, I take the simplest case of a single variant. For this I turn o John Fox's book, "Applied Regression Analysis and Generalized Linear Models, p 245 and generate this 'R' code:
> library(car)
> attach(Davis)
# remove the NA's
> narepwt <- repwt[!is.na(repwt)]
> meanrw <- mean(narepwt)
> drw <- narepwt - meanrw
> ssrw <- sum(drw * drw)
> h <- 1/length(narepwt) + (drw * drw)/ssrw
> h
This gives me a array of values the largest of which is
> order(h, decreasing=TRUE)
[1] 21 52 17 93 30 62 1...
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 *