Definition
"Standardization"isdefinedas:"Inthesocialpracticeofeconomy,technology,science,andmanagement,theTheformulation,releaseandimplementationofstandards(standards,regulationsandsystems,etc.)areunifiedtoobtainthebestorderandsocialbenefits."Datanormalizationistoconverttheoriginalmeasurementvalueintoadimensionlessvalue.Byscalingtheattributedataproportionally,theentirevaluerangeofagivenattributeismappedtoanewvaluerangethroughafunction,thatis,eacholdvalueisreplacedbyanewvalue.Thereare3standardizationstrategies.
StandardMethodOne
——Minimum-Max(min-max)normalization
Minimum-Maxnormalizationmaintainstherelationshipbetweentheoriginaldata.IfthefutureinputfallsoutsidetheoriginaldatarangeofA,thismethodwillfacean"out-of-boundserror".
Normativemethodtwo
——z-scorenormalization
Whentheactualmaximumandminimumvaluesoftheattributefareunknown,ortheabnormalpointinfluencestheminimum-maximumnormalizationWhenthismethodisuseful.
Normalizationmethodthree
——Decimalscalingnormalization
DecimalscalingnormalizationisnormalizedbymovingthedecimalpointpositionofattributeA.