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Realcom only understands numeric variables, so you will need to generate the categorical dummies before importing the data.

If you still find the problem after running again and can replicate it on simulated data then we could look at that instead.

If you can sent a copy of your data and information on the model specification to H.Goldstein@bristol.ac.uk then we can investigate what is causing the issue.

Can you confirm whether you added any factors to the model before running it, as I am able to replicate the message that you saw if I have no factors, but as soon as I add one the model is estimated without errors?

Have you checked the residual output columns? It's possible that this error is due to a calculation problem with only one of the residual types and that the one that you are interested in was calculated correctly. To check wither it's the missing values in the data set that are causing the problem y...

It's possible that your data isn't sorted in the order of the model hierarchy. MLwiN generally uses the fact that the unit number has changed to determine that it is the next unit so if you had the same unit number twice, but with a different one in between it would be counted as two different units.

This is a usually caused by a Stata limit, see http://www.cmm.bristol.ac.uk/forum/viewtopic.php?f=3&t=176 for a possible workaround. Note, you should not longer need to increase the MLwiN maximum number of explanatory variables as indicated in the solution because runmlwin now sets this based on...

There are two likely causes of this error message:

1) You don't have enough worksheet space allocated (It needs at least the length of the source column to be available), in which case you can fix it by increasing the worksheet size.

or

2) The source column contains no data.

Yes, you should receive a link to the download from info-cmm@bristol.ac.uk.

In order to use Realcom-Impute you need to first install the Matlab runtime that matches the version that it was compiled with (currently 2009a). You can obtain this by following the instructions given in http://www.bristol.ac.uk/cmm/software/realcom/#matlab.