Displaying 5 results from an estimated 5 matches for "pirls".
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2012 Jun 10
2
sampling weights for multilevel models
Dear all,
I am struggling with a problem which I have been reading on the forums about
and it did not seem to me that there is a precise answer to my question.
However, I still hope there is one.
I am working with http://timss.bc.edu/ PIRLS data and trying to conduct
multilevel analysis. There are different weights for each level of analysis
in the PIRLS dataset (e.g. there is a school weight, class weight, student
weight).
Is there a function in R which would let me use different weights for
different levels of my model?
If yes,...
2016 Apr 26
0
From NUM to INT
....
-- Bert
On Tue, Apr 26, 2016 at 2:25 PM, Andr? Luis Neves <andrluis at ualberta.ca> wrote:
> Ok. I`m trying to run a Poisson glmm with an observation-level random
> intercept. But I`m getting the following error for the 'Baci' variable:
>
> 'Error: (maxstephalfit) PIRLS step-halvings failed to reduce deviance in
> pwrssUpdate'. I guess this message is because the baci variable is not a
> an integer,
Why would you "guess" that? Given your magnitudes, I suspect it's a
scaling issue. Try centering and scaling your Baci variable before
fittin...
2016 Apr 26
2
From NUM to INT
Ok. I`m trying to run a Poisson glmm with an observation-level random
intercept. But I`m getting the following error for the 'Baci' variable:
'Error: (maxstephalfit) PIRLS step-halvings failed to reduce deviance in
pwrssUpdate'. I guess this message is because the baci variable is not a
an integer, and cannot be transformed into an integer as R has a threshold
of
2x10^9 even in 64 bit R.
It runs fine for the fungii variable.
If you guys want to run the data (a...
2016 Apr 26
0
From NUM to INT
Can you explain why you need them as 'integer', A floating point
representation can hold a value upto ~4.5e15 as an "integer" keeping the
precision that you might need.
Jim Holtman
Data Munger Guru
What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.
On Tue, Apr 26, 2016 at 1:11 PM, Andr? Luis Neves <andrluis at
2016 Apr 26
5
From NUM to INT
Dear all:
I converted the columns (Baci, Meti, Fungii, Protozoai) into integers
(using excel) and then imported the data (.txt) into R. Interestingly, the
other three variables were loaded as INT, but the 'Baci' one continued as
Num.
I imported the data using the following command line:
X <- read.delim(file.choose(),
header = TRUE,
dec =