Dear all,
I don't understand how amelia handles imputation of ordinal variables.
We can read in Amelia II: A Program for Missing Data:
"Imputations for variables set as ordinal are created by taking the
continuously valued imputation and using
an appropriately scaled version of this as the probability of success in
a binomial distribution. The draw from
this binomial distribution is then translated back into one of the
ordinal categories."
This is not explicit enough for me. I don't understand what does
"appropriately scaled" mean
and what's the link with binomial distribution. Can you give me more
explanations ?
Thank you for your cooperation.
V.Audigier
Good morning,
I am using amelia II on mass spec data, in order to deal with missing
values. I have two questions:
1) my experimental setup is as follows: the intensities of the same
proteins were measured in ctrl, condition 1, condition2, condition3,
condition4. This model implies that certain proteins might not be present
at all in a certain condition, while being present in several other
conditions. hence, I don not want amelia to impute these values. In other
words, I want amelia to only impute WITHIN conditions. At least this is the
way I though of this problem and I sub-devided the data frame into 5,
according to conditions, and fed amelia each condition separately.
Is this approach OK?
2) I perform m=10 imputations, and fit each imputed data set to a linear
model, hence I get 10 slightly different outputs. In R, what is the best
way to pool the results of m data sets?
Thank you very much for your help, I appreciate it.
Have a good New Years!!
Regards,
Elisa
I'm having trouble launching - using AmeliaView.
When I click on the AmeliaView short-cut, a screen displays very
briefly (looks like a MSDOC command line screen, black background) then
nothing....
I've downloaded and installed the most recent version of R
I downloaded the AmeliaView.exe file and installed AmeliaView,
as per the instructions on Gary Kings website,
but cannot get AmeliaView to launch.
Any suggestions or help would be appreciated.
Peter Finn
Psych Brain Sciences
Indiana University
Hi folks,
We're happy to announce Amelia 1.6.4. Updates include:
* Fixes recent slowdown and errors in Amelia under R-2.15.2.
* New arguments to tscsPlot() to allow for plotting multiple
cross-sectional units on the same panel.
* Maintainer emails have been updated to real email addresses.
* Removed the "Hold in R memory" output option in AmeliaView. This violated
CRAN policies. (We'll try to bring it back)
* Minor bug fixes.
You can install the new version using the following code:
install.packages("Amelia", repos = "http://cran.r-project.org", type =
"source")
The new version should populate to other CRAN mirrors over the coming days.
Please let us know if you see any issues.
Cheers,
matt.
~~~~~~~~~~~
Matthew Blackwell
Assistant Professor of Political Science
University of Rochester
url: http://www.mattblackwell.org
Hello
I'm eman . PhD student from university of Nottingham.
I tried to download Amelia software and R program, but they didn't work.
there is instruction on Amelia website telling that we have to download this file (link) but the link is not opening, So how can we got the (this file)???
and how I can download Amelia correctly
Thanks
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