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What does a negative value of Mean Error indicate?

Question asked by sirajwls on Jun 19, 2019
Latest reply on Jun 20, 2019 by sirajwls
The problem is :
"I performed IDW for EMF levels from cell phone towers. The resulting Mean Prediction error in cross-validation is -0.0081."
I've read about Mean Prediction Error and RMS Prediction Error in IDW on ArcGIS websites. But nowhere is it mentioned about what conclusions to draw if the Mean Prediction Error has a negative value
Cross-validation of IDW