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CG204-en-GB_v2.3 5/15
11
nxx /
StatisticalAnalysisConsiderations
Themetercalculatesstatisticsfromamaximumof80readings(ForGroup1throughGroup4,amaximum
of400readingscanbestored).NotethatreadingscannotbestoredwheninDIRECTmode.However,
statisticsonthesereadingscanstillbecalculated.Whenthemeterispoweredofforif
theworkingmodeis
changed(intheprogrammingmenu),theDIRECTmodestatisticswillbelost.Thefollowingstatisticalvalues
canbecalculated:
NO.:Numberofreadings
AVG:Averagevalue
Sdev.:Standarddeviation(squarerootofadataset’svariance)
MAX:Maximumreading
MIN:
Minimumreading
StatisticalTerms
Averagevalue( x )isthesumofreadingsdividedbythenumberofreadings.
StandardDeviation(Sdev)
Thesamplestandarddeviationisastatisticthatmeasureshowthesamplevalueisdistributedaround
thesamplemean.ThestandarddeviationofasetofnumbersistherootmeansquareofthevarianceS
2
Thevarianceofalististhesquareofthestandarddeviationofthelist,thatis,theaverageofthe
squaresofthedeviationsofthenumbersinthelistfromtheirmeandividedbythe(numberofreadings‐
1)
Variance:S
2
=
)1/()(
2
nxx
Standarddeviation:S=
2
S
NOTE:
UsetheDELETEparameterfromtheprogrammingmenuimmediatelyafteranoutlierorerraticreading
hasbeentaken.RefertotheDeletefunctioninProgrammingMenu.
StorageCapacityOverflow
InGROUPmode,ifthestoragecapacityisexceeded,stat istics will not beupdated,although
measurementscanstillbemade.Ifthememoryisfull,subsequentreadingswillnotbeincludedinthe
statistics.Themeter’sdisplaywillshow“FULL”(intheSINGLEmeasurementmode).
InDIRECTmode,whenthememory
isfull,thenewestreadingwillreplacetheoldestreadingandthe
statisticswillbeupdated.
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