On Tue, 19 May 2009, Stephen J. Barr wrote:
Ah, thank you for the help, and for the explanation of what is going
on. I suppose I will have to reload my data with plm.data set such
that RATE is not a factor.
plmWithDensity$RATE <- as.numeric(as.character(plmWithDensity$RATE))
should suffice.
For my time index, will
2000,2000.25,2000.5, etc. work? Meaning 2000 quarter 1, 2000 quarter
2, etc? Or is there some special way that I need to format the time?
That's ok. Internally, plm.data always stores it as a factor anyway.
Best,
Z
Thanks,
-stephen
==========================================
Stephen J. Barr
University of Washington
WEB: www.econsteve.com
==========================================
On Tue, May 19, 2009 at 4:39 PM, Achim Zeileis
<achim.zeil...@wu-wien.ac.at> wrote:
On Tue, 19 May 2009, Stephen J. Barr wrote:
Hello,
I am working on a data set (already as a plm.data object) located
here: http://econsteve.com/arch/plmWithDensity.Robj
With the following R session:
library(plm)
...
load("plmWithDensity.Robj")
model <- plm(RATE ~ density08, data=plmWithDensity)
Error: subscript out of bounds
I am not understanding the "subscript out of bounds" error, as this is
I agree that the error is not very meaningful but the problem is due to your
data: density08 does not vary within your id variable (COURT), hence the
default within model cannot be estimated. And it is also the reason why
density08 gets no coefficient in a larger model.
Also note that your RATE variable is a factor...I'm pretty certain you want
a numeric variable here!
Yves & Giovanni: What happens in the code is that the model.matrix() method
silently omits the column from the regressor matrix. Hence, this goes
unnoticed in the larger model and results in a regressor matrix without any
columns in the case above. Thus, the subscript error.
hth,
Z
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