with n denoting a non-negative integer that defines the degree of the numerator and m denoting a non-negative integer that defines the degree of the denominator.
For fitting rational function models, the constant term in the denominator is usually set to 1.
Rational functions are typically identified by the degrees of the numerator and denominator.
For example, a quadratic for the numerator and a cubic for the denominator is identified as a quadratic/cubic rational function.
Rational function models have the following advantages: Rational function models have the following disadvantages: This article incorporates public domain material from the National Institute of Standards and Technology