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Normalization



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

Whentheactualmaximumandminimumvalues​​oftheattributefareunknown,ortheabnormalpointinfluencestheminimum-maximumnormalizationWhenthismethodisuseful.

Normalizationmethodthree

——Decimalscalingnormalization

DecimalscalingnormalizationisnormalizedbymovingthedecimalpointpositionofattributeA.

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