﻿ TrendLinePolynomial(String,Series,Int32) Method
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 dotnetCHARTING Namespace > ForecastEngine Class > TrendLinePolynomial Method : TrendLinePolynomial(String,Series,Int32) Method

seriesName
The name of the series which will be displayed on the chart, i.e. its label.
s
A statistical series.
degree
The degree of the polynomial which is fitted to the data set given (i.e. if degree is 2, then a quadratic is fitted).
Fits a polynomial of a given degree to a data set in accordance with the least squares approach and returned the values of the fitted function over the same range of the x-coordinate as the given data set.

# Syntax

Visual Basic (Declaration)
```Public Overloads Shared Function TrendLinePolynomial( _
ByVal seriesName As String, _
ByVal s As Series, _
ByVal degree As Integer _
) As Series```
Visual Basic (Usage)Copy Code
``````Dim seriesName As String
Dim s As Series
Dim degree As Integer
Dim value As Series

value = ForecastEngine.TrendLinePolynomial(seriesName, s, degree)``````
C#
```public static Series TrendLinePolynomial(
string seriesName,
Series s,
int degree
)```

#### Parameters

seriesName
The name of the series which will be displayed on the chart, i.e. its label.
s
A statistical series.
degree
The degree of the polynomial which is fitted to the data set given (i.e. if degree is 2, then a quadratic is fitted).

# Remarks

For example, if we fit a polynomial of degree 2, then we fit the quadratic polynomial (i.e. f(x) = a_0 + a_1 x + a_2 x^2); similarly if we fit a polynomial of degree 3, then we fit the cubic polynomial (i.e. f(x) = a_0 + a_1 x + a_2 x^2 + a_3 x^3).