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Table 2 Equations and abbreviations of pre-processing methods.

From: Classification of root canal microorganisms using electronic-nose and discriminant analysis

Baseline Value Sensor Response Model Equation Abbreviation
Baseline value-1
R i o = R i min
Difference model x i = R i max R i min = Δ R i d1
  Fractional difference model x i = Δ R i  / R i min fd1
  Normalized fractional difference model x i = ( Δ R i /R i min ) / ( Δ R i /R i min ) max nfd1
Baseline value-2
R i o = R i first
Difference model x i = R i max R i first = Δ R i d2
  Fractional difference model x i = Δ R i  / R i first fd2
  Normalized fractional difference model x i = ( Δ R i /R i first ) / ( Δ R i /R i first ) max nfd2
Baseline value-3
R i o = R i bp
Difference model x i = R i max R i bp = Δ R i d3
  Fractional difference model x i = Δ R i  / R i bp fd3
  Normalized fractional difference model x i = ( Δ R i /R i bp ) / ( Δ R i /R i bp ) max nfd3