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I'm using SPSS for building a neural network model. In the model summary there is a measure called "Relative Error". What's the formula for it? Is it related to sum of squares error?

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From the documentation:

The relative error for each scale-dependent variable is the ratio of the sum-of-squares error for the dependent variable to the sum-of-squares error for the “null” model, in which the mean value of the dependent variable is used as the predicted value for each case

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