Negative values after areal interpolation

Discussion created by sure1228 on Apr 24, 2013
Latest reply on Oct 31, 2013 by EKrause-esristaff
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?