rgr (version 1.1.0)

anova2: Analysis of Variance (ANOVA), Alternate Input

Description

Function to prepare data stored in alternate forms from that expected by function anova1 for its use. For further details see 'x' in Arguments below .

Usage

anova2(x, name = deparse(substitute(x)), log = FALSE, ifalt = FALSE)

Arguments

x

a column vector from a matrix or dataframe, x[1], ..., x[2*n]. The default is that the first n members of the vector are the first measurements and the second n members are the duplicate measurements. If the measurements alternate, i.e. dupl

name

a title can be displayed with the results, e.g., name = "Duplicate measurements of Magnetic Susceptibility". If this field is undefined the character string for x is used as a default.

log

if a logarithmic transformation of the data is required to meet homogeneity of variance considerations (i.e. severe heteroscedasticity) set log = TRUE. This is also advisable if the range of the observations exceeds 1.5 orders of magnitude.

ifalt

set ifalt = TRUE to accommodate alternating sets of paired observations.

Details

For further details see anova1. If the data are as n duplicate pairs, x1 and x2, use function anova1.

See Also

anova1, ltdl.fix.df

Examples

## Make test data available
data(ms.data2)
attach(ms.data2)

## Undertake an ANOVA for duplicate measurements on rock samples
anova2(MS, log = TRUE, 
	name = "Duplicate measurements of Magnetic Susceptibility")

## Detach test data
detach(ms.data2)

## Make test data available
data(ms.data3)
attach(ms.data3)

## Undertake an ANOVA for duplicate measurements on rock samples
anova2(MS, log = TRUE, ifalt = TRUE, 
	name = "Duplicate measurements of Magnetic Susceptibility")

## Detach test data
detach(ms.data3)