Creating Polynomial Scales

In the Create New Custom Scale wizard, follow these steps:

1. Enter the scale name and description.
2. Select Polynomial Scale in the Scale Type selection box and click Next.
3. In the Enter Forward Polynomial Coefficients dialog box, select the forward coefficients a₀, a₁, a₂,...a_n for your polynomial scale:

   y=a₀+ a₁x+ a₂x²+…+a_nxⁿ

   where y is the scaled data and x is the raw data.

   1. In the coefficient list box, select the coefficient you want to change by highlighting the corresponding row and click Change. Specify the coefficient in the Add Coefficient dialog box and click OK.
   2. Click Remove to remove a coefficient. Click Import from File to import the coefficients from a spreadsheet file.
   3. Click Next to continue.
4. In the Enter Reverse Polynomial Coefficients dialog box, select the reverse coefficients a₀, a₁, a₂,...a_n for your polynomial scale:

   x=a₀+ a₁y+ a₂y²+…+a_nyⁿ

   where y is the scaled data and x is the raw data.

   1. To enter the reverse coefficients, follow the same steps as the forward coefficients, or click Auto Compute and MAX automatically estimates the reverse coefficients using regression analysis. To compute reverse coefficients, enter minimum and maximum values for the raw range. Enter an order value. Click OK to calculate reverse coefficients.
   2. Click Next to continue.
5. Verify the scale plot in the Verify Scale dialog box. If it is not correct, click Back and adjust your coefficient values. Adjust the raw minimum and maximum values, if necessary, and click Apply.
6. Click Finish when you are done.