anova.trls              package:spatial              R Documentation

Anova tables for fitted trend surface objects

Description:

     Compute analysis of variance tables for one or more fitted trend
     surface model objects; where 'anova.trls' is called with multiple
     objects, it passes on the arguments to 'anovalist.trls'.

Usage:

     ## S3 method for class 'trls':
     anova(object, ...)
     anovalist.trls(object, ...)

Arguments:

  object: A fitted trend surface model object from 'surf.ls' 

     ...: Further objects of the same kind 

Value:

     'anova.trls' and 'anovalist.trls' return objects corresponding to
     their printed tabular output.

References:

     Venables, W. N. and Ripley, B. D. (2002) _Modern Applied
     Statistics with S._ Fourth edition.  Springer.

See Also:

     'surf.ls'

Examples:

     library(stats)
     data(topo, package="MASS")
     topo0 <- surf.ls(0, topo)
     topo1 <- surf.ls(1, topo)
     topo2 <- surf.ls(2, topo)
     topo3 <- surf.ls(3, topo)
     topo4 <- surf.ls(4, topo)
     anova(topo0, topo1, topo2, topo3, topo4)
     summary(topo4)

