12 Oct
2020
12 Oct
'20
9:55 p.m.
Hi Stuart,
Ah, `combine.output()` actually just takes multiple Amelia runs that were
done separately and combines them into one object, as if you didn't them
all together. This is helpful if you want to run additional imputations
after a first batch. Here is some code that will take Amelia output and
create a stacked data frame of all imputations with a column for imputation
numbers:
library(Amelia)
data(africa)
imps <- 5
a.out <- amelia(africa, cs = "country", ts = "year", m = imps)
stacked_df <- do.call(rbind, a.out$imputations)
stacked_df$imp_number <- rep(1:imps, each = nrow(africa))
Having said all of that, you probably don't want to do this. Instead, you
probably want to apply your analysis model to each of the imputed data sets
and then combine the coefficients/model parameters using the Rubin rules
described in the various Amelia papers.
Cheers,
Matt
~~~~~~~~~~~
Matthew Blackwell
Associate Professor of Government
Harvard University
url: http://www.mattblackwell.org
On Fri, Oct 9, 2020 at 10:33 PM <stuart.reece(a)bigpond.com> wrote:
Hi Amelia Users.
I am running a Windows computer i9-9900K CPU 3.6GHz, 64MB RAM, 64-bit
system.
I have the R Studio 1.3.1093 based on R 4.0.2, just re-installed today.
Amelia works on my data and runs models very nicely. The parallel
routines work really well, which I very much appreciate on my 16 CPU’s.
However I use complex geospatial models and would love to model the
complete imputed geospatial data in R::splm.
So combining all the imputations into one df would be a fantastic
assistance.
I think combine.output should do this very nicely.
I think the syntax for combine.output is probably like that of ameliabind
– really simple…. Can’t find the syntax online….
But whenever I run combine.output – with whatever syntax – I always get
the same error message which reads:
CombAmelia1616 <- Amelia::combine.output(a.r.CS.Raw.ETOPFA.LIR.02.16,
a.r.CS.Raw.ETOPFA.LIR.02.16e)
Error: 'combine.output' is not an exported object from
'namespace:Amelia'
I was wondering please if something is wrong??
Also – could someone please confirm that the correct syntax for
combine.output is the same as ameliabind – super simple????
Thanks so much,
Stuart Reece.