Prediction model having zero value for variable results NAN P-value
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I am developing a quadratic model. the coefficient for one variable is zero and which results P-value as Nan. What may be the reason for this situation and how can we solve it?
Similary, while running this model, a different message has shown in command window i.e " Warning: Regression design matrix is rank deficient to within machine precision. "
What may be the solution for this problem?
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