A primer for nonresponse in the US forest inventory and analysis program |
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Authors: | Email author" target="_blank">Paul?L?PattersonEmail author John?W?Coulston Francis?A?Roesch James?A?Westfall Andrew?D?Hill |
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Institution: | U.S. Forest Service, Rocky Mountain Research Station, 2150A Centre Ave, Suite 350, Fort Collins, CO 80526, USA. plpatterson@fs.fed.us |
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Abstract: | Nonresponse caused by denied access and hazardous conditions are a concern for the USDA Forest Service, Forest Inventory and
Analysis (FIA) program, whose mission is to quantify status and trends in forest resources across the USA. Any appreciable
amount of nonresponse can cause bias in FIA’s estimates of population parameters. This paper will quantify the magnitude of
nonresponse and describe the mechanisms that result in nonresponse, describe and qualitatively evaluate FIA’s assumptions
regarding nonresponse, provide a recommendation concerning plot replacement strategies, and identify appropriate strategies
to pursue that minimize bias. The nonresponse rates ranged from 0% to 21% and differed by land owner group; with denied access
to private land the leading cause of nonresponse. Current FIA estimators assume that nonresponse occurs at random. Although
in most cases this assumption appears tenable, a qualitative assessment indicates a few situations where the assumption is
not tenable. In the short-term, we recommend that FIA use stratification schemes that make the missing at random assumption
tenable. We recommend the examination of alternative estimation techniques that use appropriate weighting and auxiliary information
to mitigate the effects of nonresponse. We recommend the replacement of nonresponse sample locations not be used. |
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