On Dec 31, 2010, at 2:49 AM, Jukka Koskela wrote:
Hello,
Could somebody please tell me what am I doing wrong in following?
I try extract coefficients (using arm-package) from the lmer
frunction, but I get the
following warning:
a<-data.frame(coef(res))
Error in as.data.frame.default(x[[i]], optional = TRUE,
stringsAsFactors = stringsAsFactors) :
cannot coerce class "coef.mer" into a data.fram
I think I have done it before the same way and it has worked, but
not any more..
Are you sure you were not looking at just one particular element of a
coef.mer object?
> fm1 <- lmer(Reaction ~ Days + (Days|Subject), sleepstudy)
> a<-data.frame(coef(fm1))
Error in as.data.frame.default(x[[i]], optional = TRUE,
stringsAsFactors = stringsAsFactors) :
cannot coerce class '"coef.mer"' into a data.frame
> coef(fm1)
$Subject
(Intercept) Days
308 253.6623 19.6665383
309 211.0067 1.8461362
310 212.4446 5.0170766
330 275.0971 5.6535771
<snipped>
.
.
> a<-data.frame(coef(fm1)[[1]])
> a
X.Intercept. Days
308 253.6623 19.6665383
309 211.0067 1.8461362
310 212.4446 5.0170766
330 275.0971 5.6535771
331 273.6664 7.3980095
<snipped>
--
David Winsemius, MD
West Hartford, CT
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