Hi Nandana,

This is a bug in the current version of Amelia that occurs when listwise deletion eliminates all observations. We have a fix for it in the development version of Amelia. You can find installation instructions for that version here:

We will be submitting this development version to CRAN in the upcoming weeks.

Cheers,

Matt

~~~~~~~~~~~

Matthew Blackwell

Assistant Professor of Government

Harvard University

url: http://www.mattblackwell.org

On Mon, Sep 28, 2015 at 12:43 PM Nandana Sengupta <nandana@uchicago.edu> wrote:

Hi,

I am running Amelia on a cleaned up subset of a single round of the National Longitudnal Survey of Youth data.

The subset used in the analysis has 64 variables.

I only kept factor variables with 2 to 10 levels in the subset, but when I run the amelia command I get the following error:

****

Error in `contrasts<-`(`*tmp*`, value = contr.funs[1 + isOF[nn]]) :

contrasts can be applied only to factors with 2 or more levels

****

On the other hand the amelia code runs if I specify "incheck = FALSE" in the command options.

I am also able to do multiple imputation on this dataset using other R software but am keen to work with Amelia, since I want to utilize the TSCS aspect of multiple imputation that the software provides.

Could you shed some light on why I am seeing the error above and also if the imputation with errors suppressed is reliable?

Thanks,

Nandana Sengupta

University of Chicago, Knowledge Lab

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