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  • getting problem with convergence in Truncated negative binomial count model

    Dear all,

    I am analyzing the recreation data, where trips taken takes non zero value. Trying with the truncated negative binomial model, am facing non-convergence when i use particular two variable in the model. When i use rest of the variable, the model convergence and fits well. I need to include one variable which is very important and leaving out that might yield biased results, but if i use it, it resulted in non-convergence.
    Please could any one let me know what is the problem with this and is there any alternative?.

    Note: Checking the dispersion the mean is far bellow that of variance (mean =4.2 and SD= 8.5)

    please help me,
    yashu
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