Title: Regression methods for spatially correlated data: an example using beetle attacks in a seed orchard
Author: Haiganoush, Preisler, K.; Rappaport, Nancy G.; Wood, David L.
Source: Forest Science, Vol. 43(1): 71-77
Description: We present a statistical procedure for studying the simultaneous effects of observed covariates and unmeasured spatial variables on responses of interest. The procedure uses regression type analyses that can be used with existing statistical software packages. An example using the rate of twig beetle attacks on Douglas-fir trees in a seed orchard illustrates the problem and the recommended statistical procedures. Use of this procedure revealed spatial patterns in beetle attacks that were not otherwise evident. We also found that the covariates, tree vigor, cone crop, and host genotype (i.e., clone) apparently had significant effects on number of beetle attacks within a model that also included location effects. This procedure should prove useful in other situations where spatial trends are of interest in themselves and are not simply viewed as nuisance parameters to be dealt with by the proper experimental design.
Keywords: Douglas-fir, nonparametric regression, Poisson counts, spatial statistics, twig beetles, Pityophthorus orarius
View and Print this Publication (630 KB)
Pristine Version: An uncaptured or "pristine" version of this publication is available. It has not been subjected to OCR (Optical Character Recognition) and therefore does not have any errors in the text. However it is a larger file size and some people may experience long download times. The "pristine" version of this publication is available here: View and Print the PRISTINE copy of this Publication
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility
Haiganoush, Preisler, K.; Rappaport, Nancy G.; Wood, David L. 1997. Regression methods for spatially correlated data: an example using beetle attacks in a seed orchard. Forest Science, Vol. 43(1): 71-77.