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Thank you for this information, I believe that I have now been able to replicate the behaviour.

When processing the data to paste it the software replaces occurrences of , with . which is behaviour left over from older versions of MLwiN that did not take regional settings into account. When it is ...

Thanks for the confirmation. If you can let me know what regional settings you have I can attempt to replicate the problem.

Do you by any chance have the decimal separator set to the European convention of , ? If so it may be that there is a mismatch with the separator generated by Excel and what MLwiN is expecting. You could check that this is the case by temporarily changing it to . and seeing whether it has more ...

Can you confirm which version of MLwiN you are using? I just tested this and it loaded correctly for me. Are you able to say which other ways you have used to try importing the data? The File>Import... menu should allow you to load a variety of text based formats.

There don't seem to be any attachments to your message, did they fail to upload?

The first thing to check would be that your command is conceptually on one line. You can split it across several lines to aid readability, however you would need to put /// at the end of each line to indicate a line continuation.

You can only specify each level once in runmlwin, so you can't have ...

These two approaches should also work with runmlwin, so it is probably worth trying both ways and then comparing with the results that you had previously from gsem.

Assuming that the data sample you provided is representative of the rest of the data I think that your problem may be that your data is not sorted by the model hierarchy. Rather than using unique values of ID codes to determine the units MLwiN instead calculates this on when the ID code changes as ...

runmlwin should (more or less) work like any other Stata command, so you should be able to use the standard Stata facilities to create the required dummies. I think that the example we provide only does it manually to make the process more explicit (and give the generated dummies names of our ...

Could you provide any further information about what your time variable represents? E.g., Is it the occasion on which a measurement was taken, as in the example in chapter 13 of the MLwiN manual ( https://www.bristol.ac.uk/cmm/media/software/mlwin/downloads/manuals/3-13/manual-web.pdf ), or is it a ...