计量型数据MSA.ppt

计量性数据MSA,简单测量分析续SimpleMeasurementStudy-continued,使用描述性统计，计算Delta的标准差UsingDescriptiveStatistics,calculatethestandarddeviationofDelta这个标准差被称为测量标准误差ThisstandarddeviationiscalledtheStandardErrorforMeasurement其主要代表了什么，重复性还是再现性？Whichdoesthisprimarilyrepresent,RepeatabilityorReproducibility?,VariableNMeanMedianStDevDelta10-0.410-0.4000.387,简单测量分析续SimpleMeasurementStudy-continued,使用上面的标准差，什么是测量分布的良好估计值Usingthestandarddeviationabove,whatwouldbeagoodestimateofmeasurementspread?,VariableNMeanMedianStDevDelta10-0.410-0.4000.387,假设公差是5（上限下限）Supposetolerance(upperspec-lowerspec)is5.精确度和公差的比率如何？Whatwouldbetheratiobetweentheprecisionandthetolerance?,简单测量分析续SimpleMeasurementStudy-continued,这个比率被称为精确度和公差比率(P/T).这个例子中P/T比率是：ThisratioisknownasthePrecisiontoTolerance(P/T)Ratio.ForthisexampletheP/TRatiois:这个可以被解读为：“46的规格公差被测量系统误差所占用了”Thisisinterpretedas:“46%ofthespecificationtoleranceistakenupbymeasurementerror”,VariableNMeanMedianStDevDelta10-0.410-0.4000.387,测量能力指数-P/TMeasurementCapabilityIndex-P/T,精确性和公差比率PrecisiontoToleranceRatio描述有多少百分比的公差是被测量系统误差占用了Addresseswhatpercentofthetoleranceistakenupbymeasurementerror同时包含了重复性和再现性Includesbothrepeatabilityandreproducibility操作者x单位x试验次数OperatorxUnitxTrialexperiment最佳情况Bestcase:10%；可以接受Acceptable:30%,通常以百分比表示Usuallyexpressedaspercent,注意：6.0标准差代表了99.73%的测量系统变差。记住在做测量系统和以前分析结果的计算时，要经常检查这个值。这里用的6.0是AIAG的工业标准。Note:6.0standarddeviationsaccountsfor99.73%ofMSvariation.Alwayscheckthevalueusedwhenmakingcomparisonsbetweenmeasurementsystemsorpreviousanalysiscalculations.Theuseof6.0istheAIAGindustrystandard.,P,T,Tolerance,MS,/,=,6.0*,s,精确度和公差比率PrecisiontoToleranceRatio,ProductTolerance,测量系统变差measurementsystemvariation,P/T=20%,P/T=100%,P/T=200%,测量能力指数%GRSUBCsample10;SUBCoperator3;SUBCtrial2.,SortcolumnsbyRunOrdertodetermin