The above plots are an example of y = f (x) polynomial least squares curve fits of the same data. The 6th order polynomial curve fit satisfies the condition where the curve fit passes through each of the six data points. The form of the equation for the 2nd order linear curve fit is y = a0 + a1x. The form of the equation for the 6th order curve fit is y = a0 + a1x + a2x2 + a3x3 + a4x4 + a5x5.
Another program included in the software package is HyperbolicFunction. The exponential form equation is useful for fitting data that extends far from the axis.
The above three plots are examples of results obtained from the Statistical Analysis software programs Statistical Dispersion, Probability Function and Cumulative Function. A complete analysis is provided for employee wages/hour.
The software includes the data plotting routine PlotXYZ.