Look more thoroughly?
You should see this about 2/3 the way down the output:
$ coefficients : num [1:14, 1:4] 3.019 -0.475 -0.709 -0.724 -0.615 ...
..- attr(*, "dimnames")=List of 2
.. ..$ : chr [1:14] "(Intercept)" "SexM" "SexF:AgeF1"
"SexM:AgeF1" ...
.. ..$ : chr [1:4] "Estimate" "Std. Error" "z value" "Pr(>|z|)"
You can also get the same information by entering:
coef(sumnb1)
--
David Winsemius
On Feb 15, 2009, at 9:40 AM, jpl wrote:
Hi Dieter,
I don't see anything in the str(model) output that matches the
standard
errors of the coefficients given in summary(model). Any other
suggestion?
Thanks.
jpl
Dieter Menne wrote:
jpl <s-jlubben1 <at> math.unl.edu> writes:
How do I extract the standard errors of the coefficients in a glm.nb
model?
library(MASS)
quine.nb1 <- glm.nb(Days ~ Sex/(Age + Eth*Lrn), data = quine)
sumnb1 = summary(quine.nb1)
sumnb1
str(sumnb1) # tells you about the anatomy. Check for $coefficients
Dieter
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