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National Survey of Fishing, Hunting, and Wildlife ... - All About Birds

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Table D-5. Parameters a, b, <strong>and</strong> c for Calculating Approximate St<strong>and</strong>ard Errors for United StatesScreener Sample, Detailed Sportsperson Sample, <strong>and</strong> <strong>Wildlife</strong>-Watching Sample for Levels,Expenditures, <strong>and</strong> Days or TripsSampleParametersa b cScreener SampleSportspersons, anglers, hunters, <strong>and</strong> wildlife-watching participants—6 years old <strong>and</strong> older ............... –0.000043 12,272 –Sportspersons, anglers, hunters, <strong>and</strong> wildlife-watching participants—6 to 15 years old ................... –0.000387 15,783 –Detailed Sportperson SampleSportspersons <strong>and</strong> anglers 16 years old <strong>and</strong> older ................................................ –0.000070 16,823 –Hunters 16 years old <strong>and</strong> older ............................................................... –0.000066 15,798 –Expenditures for sportspersons <strong>and</strong> anglers 16 years old <strong>and</strong> older ................................... 0.001159 –575,615 45,670Expenditures for hunters 16 years old <strong>and</strong> older ................................................. 0.001923 –978,460 44,416Days or trips for sportspersons <strong>and</strong> anglers 16 years old <strong>and</strong> older ................................... 0.000068 –160,414 51,951Days or trips for hunters 16 years old <strong>and</strong> older .................................................. –0.000284 –127,863 46,699<strong>Wildlife</strong>-Watching SampleLevels <strong>of</strong> wildlife-watching—away-from-home participants ........................................ –0.000134 32,078 –Levels <strong>of</strong> wildlife-watching—wildlife-watching participants 1 ....................................... –0.000119 28,477 –Expenditures for wildlife-watching ........................................................... 0.001308 –1,548,024 112,362Days or trips for wildlife-watching ............................................................ 0.002307 826,023 54,1001Use these parameters for total wildlife-watching participants <strong>and</strong> around-the-home participants.U.S. Fish <strong>and</strong> <strong>Wildlife</strong> Service <strong>and</strong> U.S. Census Bureau 2011 <strong>National</strong> <strong>Survey</strong> <strong>of</strong> <strong>Fishing</strong>, <strong>Hunting</strong>, <strong>and</strong> <strong>Wildlife</strong>-Associated Recreation 131

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