What does a negative value of 'Mean Error' mean?

[SirajMazumder]

Hello everybody,

I'm stuck up at some point of performing IDW.

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

I've attached a screen-shot of the summary statistics.

Thanks in anticipation

[Anonymous User]

Duplicate questions with answers https://community.esri.com/thread/235528-what-does-a-negative-value-of-mean-error-indicate