Gretchen G. Moisen
Iowa State University
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Publication
Featured researches published by Gretchen G. Moisen.
Journal of the American Statistical Association | 2007
Jean D. Opsomer; F. Jay Breidt; Gretchen G. Moisen; Göran Kauermann
Multiphase surveys are often conducted in forest inventories, with the goal of estimating forested area and tree characteristics over large regions. This article describes how design-based estimation of such quantities, based on information gathered during ground visits of sampled plots, can be made more precise by incorporating auxiliary information available from remote sensing. The relationship between the ground visit measurements and the remote sensing variables is modeled using generalized additive models. Nonparametric estimators for these models are discussed and applied to forest data collected in the mountains of northern Utah. Model-assisted estimators that use the nonparametric regression fits are proposed for these data. The design context of this study is two-phase systematic sampling from a spatial continuum, under which properties of model-assisted estimators are derived. Difficulties with the standard variance estimation approach, which assumes simple random sampling in each phase, are described. An alternative assessment of estimator performance based on a synthetic population is implemented and shows that using the model predictions in a model-assisted survey estimation procedure results in substantial efficiency improvements over current estimation approaches.
Journal of survey statistics and methodology | 2017
Kelly S. McConville; F. Jay Breidt; Thomas C. M. Lee; Gretchen G. Moisen
Archive | 2012
Tracey S. Frescino; Paul L. Patterson; Elizabeth A. Freeman; Gretchen G. Moisen
In: McWilliams, Will; Roesch, Francis A. eds. 2012. Monitoring Across Borders: 2010 Joint Meeting of the Forest Inventory and Analysis (FIA) Symposium and the Southern Mensurationists. e-Gen. Tech. Rep. SRS-157. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. 189-192. | 2012
Thomas A. Jackson; Gretchen G. Moisen; Paul L. Patterson; John Tipton
Archive | 2016
Tracey S. Frescino; Gretchen G. Moisen; Paul L. Patterson; Elizabeth A. Freeman; James Menlove
Archive | 2015
Xiyue Liao; Gretchen G. Moisen; Elizabeth A. Freeman
Archive | 2015
Marek Matyjasik; Gretchen G. Moisen; Todd A. Schroeder; Tracy Frescino; Michael Hernandez
Archive | 2015
Sean P. Healey; Warren B. Cohen; Yang Zhiqiang; Ken Brewer; Evan B. Brooks; Noel Gorelick; Mathew Gregory; Alexander J. Hernandez; Chengquan Huang; Joseph Hughes; Robert E. Kennedy; Thomas R. Loveland; Kevin Megown; Gretchen G. Moisen; Todd A. Schroeder; Brian Schwind; Stephen V. Stehman; Daniel Steinwand; James E. Vogelmann; Curtis E. Woodcock; Limin Yang; Zhe Zhu
Archive | 2015
Tracey S. Frescino; Paul L. Patterson; Gretchen G. Moisen; Elizabeth A. Freeman
Archive | 2015
Warren B. Cohen; Hans-Erik Andersen; Sean P. Healey; Gretchen G. Moisen; Todd A. Schroeder; Christopher W. Woodall; Grant M. Domke; Zhiqiang Yang; Robert E. Kennedy; Stephen V. Stehman; Curtis E. Woodcock; Jim Vogelmann; Zhe Zhu; Chengquan Huang