University of Wisconsin-Madison Department of Agricultural & Applied Economics Staff Paper No. 510 July 2007 Unbalanced Nested Component Error and the Value of Soil I nsecticide and Bt Corn for Controlling Western Corn Rootworm By Juan Yang, Paul D. Mitchell, Michael Gray and Kevin Steffey __________________________________ AGRICULTURAL & APPLIED ECONOMICS ____________________________ STAFF PAPER SERIES Copyright © 2007 Juan Yang, Paul D. Mitchell, Michael Gray & Kevin Steffey. All rights reserved. Readers may make verbatim copies of this document for non-commercial purposes by any means, provided that this copyright notice appears on all such copies.