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Polynomial

Statistical Glossary

Polynomial:

A polynomial of order Math image is a function described by the following expression:

where

  • Math image are coefficients of the polynomial.

A polynomial of order Math image is the simplest type of polynomial. Its chart, Math image against Math image , is a line.

Polynomials are used in regression analysis, multiple regression, time series analysis. In a sense, polynomials are the first choice models for various smooth functions, and they are often used for approximation and interpolation of continuous functions. Polynomials are also used as building blocks for splines .

Besides the 1-dimensional polynomials described above, there are extensions to 2-dimensional cases (where the polynomial is a function Math image of two variables), and to a higher number of dimensions.

See also short courses

Introduction to Regression,

Time Series Forecasting ,

Logistic Regression .

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