Running Bilog-mg vertical equating example in MultipleGroup with little item overlap between groups

[Donald Rock]

Hi All: I have tried to run example 5 from the bilogmg manual but get error message e.g, NA/NaN.  There is only 2 items overlapping group 1 and group 2 and similarly there is only two items overlappig group 2 and group 3.  Maybe it is trying to tell me that there is not enough common information in such an unrealistic example.  The strange thing is Bil;ogmg encounters no problems and yields what appear to be reasonable estimates of item parameters.and group means.

[Phil Chalmers]

Hi Donald,

I don't have access to BILOG-MG or the datasets. Could you provide the analysis code and required data files so that we can reproduce the issue?

Phil

On Wed, Nov 25, 2015 at 10:25 AM, 'Donald Rock' via mirt-package <mirt-p...@googlegroups.com> wrote:

Hi All: I have tried to run example 5 from the bilogmg manual but get error message e.g, NA/NaN.  There is only 2 items overlapping group 1 and group 2 and similarly there is only two items overlappig group 2 and group 3.  Maybe it is trying to tell me that there is not enough common information in such an unrealistic example.  The strange thing is Bil;ogmg encounters no problems and yields what appear to be reasonable estimates of item parameters.and group means.

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