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  • Problem with spike command

    Hello,

    I am trying to estimate willingness to pay using the spike command, but I keep receiving the following error:

    "could not calculate numerical derivatives
    missing values encountered"

    For some reason, the model won't converge. I have attached the dataset that I am using, the code is

    . spike s t bid, robust

    Has anyone encountered this issue? Also this is my first time posting so I apologize if I have left out relevant info/formatted something incorrectly!!

    Thank you!
    Attached Files
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