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Unexpected singularities in the Hessian matrix in NOMREG (Multinomial Logistic Regression)

Troubleshooting


Problem

I'm running the SPSS NOMREG (Multinomial Logistic Regression) procedure. I'm receiving the following warning message: Unexpected singularities in the Hessian matrix are encountered. This indicates that either some predictor variables should be excluded or some categories should be merged. The NOMREG procedure continues despite the above warning(s). Subsequent results shown are based on the last iteration. Validity of the model fit is uncertain. I know that I don't have any linear dependencies among my predictors (for example, I can use them all in a linear regression without problems), and none of them are categorical. What does the warning mean when it says that some categories should be merged?

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Historical Number

71043

Document Information

Modified date:
16 June 2018

UID

swg21480408

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