- Name of first metric/shape file.
- Name of second metric/shape file.

- Name of output metric/shape file which will contain the Levene
F-Statistic, the numerator degrees of freedom, the denominator degrees
of freedom, and an P-Value.

- Please see http://www.people.vcu.edu/~wsstreet/courses/314_20033/Handout.Levene.pdf
on which the calculations are based or http://www.itl.nist.gov/div898/handbook/eda/section3/eda35a.htm
which has some difficult to decipher images.