polydeg: Degree of Polynomial Determination

Description Usage Arguments Details Value References Examples

View source: R/polydeg.R

Description

Tests for the degree of a polnomial. This test was suggested by Graybill (1976) and is discussed from a robust point-of-view in Section 4.7.1. of Kloke and McKean (2014).

Usage

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polydeg(y, x, P, alpha = 0.05) 

Arguments

y

vector of responses

x

Predictor

P

Super degree of polynomial which provides a satisfactory fit

alpha

Level of the testing

Details

Returns the degree of the polynomial based on the algorithm.

Value

deg

The determined degree

coll

Matrix of step information

fitf

Fit of the polynomial based on the determoned degreer

References

Graybill, F.A. (1976), Theory and application of the linear model, North Scituate, Ma: Duxbury Press.

Kloke, J. and McKean, J.W. (2014), Nonparametric statistcal methods using R, Boca Raton, FL: Chapman-Hall.

Examples

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 x <- 1:20
 xc <- x - mean(x)
 y<- .2*xc + xc^3 +rt(20,3)*90
 plot(y~x)
 polydeg(y,xc,6)

kloke/npsm documentation built on May 18, 2017, 9:42 p.m.