quantchem (version 0.13)

anova.lmcal, anova.nlscal: ANOVA tests for calibration models

Description

This function performs ANOVA tests between fitted calibration models.

Usage

"anova"(object, ...) "anova"(object, ...)

Arguments

object
an object of class 'lmcal' or 'nlscal'
...
additional arguments (ignored)

Value

A list of 'anova' objects:
mandel
The test between linear and quadratic fit
logmandel
The same test, between two log-log models
table
The test between linear, quadratic, cubical and 4th order models without weighting
wtable
The test between linear, quadratic, cubical and 4th order models with weighting

Details

For 'lmcal' models this function performs four tests: two ANOVAs between linear and quadratic model, without and with log-log transform (first is mentioned in literature as Mandel's fitting test), and two ANOVAs comparing four polynomial models, weighted and unweighted.

For 'nlscal' models two ANOVAs are performed - between asymptotic models without and with intercept term, and between three and four parameter logistic models.

See Also

lmcal, nlscal

Examples

data(nitrate)
attach(nitrate)
fit = lmcal(conc,area)
anova(fit)
fit2 = nlscal(conc,area)
anova(fit2)