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Thanks for your reply. I'll try out the list wise deletion.

1. Does Realcom-Impute impute missing values when the MOI (model Of Interest) consists of interaction terms?
2. Should MOI be a main effects model?
3. Does anyone has a clear idea about how MOI should be? Is it the best model for complete cases?

Please give your comments.

My data set consists of 86 level 2 units. In the names window it appears min:1 & max: 86. But when the model is stored, it says number of level 2 units is 87. Why is this?

I get an error message when I try to calculate level 2 residuals.(My data set contains missing values.) "Numeric error(s) in calculate command. Affected entries replaced with system missing. See output window for details." Then output window appears as follows. "-->WEST reallocating h...

I need to simulate a data set where all explanatory variables and the response variable is categorical. This should be a mix of binary, ordered categorical and unordered categorical variables.
Can someone please help me to do this using MLwiN?

I worked for sometime with the MLwiN 2.25 version. But now it doesn't execute. When I click on the icon an error message appears saying "Insufficient memory for the specified worksheet size"
Please help me with this error as soon as possible.