ProportionalRegressionFormula  = " y=a·x "
QuadraticRegressionFormula  = " y=a·x^2+b·x+c "
CubicRegressionFormula  = " y=a·x^3+b·x^2+c·x+d "
QuarticRegressionFormula  = " y=a·x^4+b·x^3+c·x^2+d·x+e "
LogarithmicRegressionFormula  = " y=a·ln(x)+b "
ExponentialRegressionFormula  = " y=a·exp(b·x) "
PowerRegressionFormula  = " y=a·x^b "
TrigonometricRegressionFormula  = " y=a·sin(b·x+c)+d "
LogisticRegressionFormula  = " y=c/(1+a·exp(-b·x)) "
Dash = "-"
Reg = "reg"
