Multivariateanalysiscanthoughbeappliedforotherpurposes
than justclusteringitems.Itispossibletoevaluatethematerial
conservationstateusingPCA.Indeed,theRamanspectra fitting
parametersoftheexternalpartsofthearcheologicalcopalswere
consideredtoPCA(Fig. 7), Thevariablesbehaviorwasthen
studied, andspecific criteriathatsortthesamplesdependingon
their surfacedegradationstatecouldbeextracted.On Fig. 7 we can
observe thatthesamplesarewellsortedthankstoPC1.Indeed,on
the negativesideofPC1wehavealltheredcopalsamples
whereas onthepositivesidewehavetheyellowcopalsamples.
Thus, PC1containsasufficient partoftheexploitedvarianceto
separatethetwogroupsofcopals. Fig. 7 also describesthe
projectionofthevariablesobtainedafterthePCAcalculation.
The fullwidthathalfmaximumofbands5and10(W5andW10)
arecorrelatedvariableswhichhaveanimportantcontributionto
PC1,andwhicharesignificant intermsofstructuralinterpretation.
As seenbefore,band10isassignedtothevibrationofCHvinyl
groups anddecreaseswithalteration.Soifweplottheitemson
the baseofthesetwovariables,weobtainachartthatsortsthe
samples accordingtoanaxis,representedbyanarrowon Fig. 8.
Multivariateanalysiscanthoughbeappliedforotherpurposes
กว่า justclusteringitemsเหมาะสม Itispossibletoevaluatethematerial
conservationstateusingPCA.Indeed,theRamanspectra
parametersoftheexternalpartsofthearcheologicalcopalswere
consideredtoPCA กิน 7), Thevariablesbehaviorwasthen
ศึกษา andspecific criteriathatsortthesamplesdependingon
surfacedegradationstatecouldbeextracted ของพวกเขาในฟิก 7 เราสามารถ
สังเกต thatthesamplesarewellsortedthankstoPC1.Indeed,on
the negativesideofPC1wehavealltheredcopalsamples
โดย onthepositivesidewehavetheyellowcopalsamples.
ดัง PC1containsasufficient partoftheexploitedvarianceto
separatethetwogroupsofcopals Fig. 7 ยัง describesthe
projectionofthevariablesobtainedafterthePCAcalculation.
fullwidthathalfmaximumofbands5and10(W5andW10)
arecorrelatedvariableswhichhaveanimportantcontributionto
PC1, andwhicharesignificant intermsofstructuralinterpretation.
เป็น seenbefore, band10isassignedtothevibrationofCHvinyl
กลุ่ม anddecreaseswithalterationSoifweplottheitemson
baseofthesetwovariables, weobtainachartthatsortsthe
ตัวอย่าง accordingtoanaxis, representedbyanarrowon Fig. 8
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