Negative values after areal interpolation

Question

Hi, guys. 
I have a problems using Areal Interpolation in ArcGIS 10.1. 
There's no negative value in my origin data. 
And there's no negative in my predicted surface. 
But after I used Areal Interpolation layer to to Polygons,there are 75 polygons with a negative value, which they really shouldn't be.
Any ideas why this happened?

ttgrdias · Answer

@EricKrause Ok, thanks. But that doesn't allow to introduce measurement errors, correct?

Eric6346 · Answer

@ttgrdias If all of the input data values are positive (no negatives or zeros), then the Log Empirical transformation ensures all predictions will be positive.

ttgrdias · Answer

Hi!

@EricKrauseis there any way to avoid negative prediction values using EBK3D?

Tks,