Designation:D2915−10StandardPracticeforSamplingandData-AnalysisforStructuralWoodandWood-BasedProducts1ThisstandardisissuedunderthefixeddesignationD2915;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONSamplinganddataanalysisshouldbeintegratedinthedesignandevaluationofwoodandwood-basedstructuralproducts.Thispracticeisusefulinassessingtheappropriatenessoftheassignedpropertiesandforcheckingtheeffectivenessofgradingprocedures.Statisticalmethodologiesareprovidedtoserveasabasisfortheempiricalestablishmentandevaluationofmeanandnearminimumpropertyestimates.Thesepopulationestimatesarethenusedbyproductstandardstoassignstructuraldesignvaluesforusewithanestablisheddesignmethodology(thatis,allowablestressdesign,loadandresistancefactordesign,limitstatesdesign,etc.).Near-minimumpropertyestimatesaretypicallyusedbytheproductstandardstodefinetheperformanceforavarietyofstructuralpropertieswherestrengthisaprimaryconsideration(thatis,extremefiberstressinbending,axialtension,axialcompression,shear,andelasticityforbucklingconcerns).Populationmeanestimatesareoftenusedtoassessserviceabilitydesigncriteriawherestrengthisnottheprimarydesignconcern(thatis,elasticityestimatesusedfordeformationcalculations,permissiblecompressionstressatadeformation,etc.).Forsituationswhereamanufacturedproductissampledrepeatedlyorlotsizesaresmall,alternativetestmethodsasdescribedinRef(1)2maybemoreapplicable.1.Scope1.1Thispracticecoverssamplingandanalysisproceduresfortheinvestigationofspecifiedpopulationsofwoodandwood-basedstructuralproductsreferredtointhisstandardasproducts.Appropriateproductstandardsshouldbereferencedforpresentationrequirementsfordata.Dependingontheinterestoftheuser,thepopulationfromwhichsamplesaretakenmayrangefromtheproductsproducedataspecificmanufacturingsitetoalltheproducts...
