rgr (version 1.1.15)

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, xname = deparse(substitute(x)), log = FALSE, ifalt = FALSE)

Arguments

x

a column vector from a matrix or data frame, 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. duplicate pair 1 measurement 1 followed by measurement 2, etc., set ifalt = TRUE.

xname

by default the character string for x is used for the title. An alternate title can be displayed with xname = "text string", see Examples.

log

if a logarithmic transformation (base 10) 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

# NOT RUN {
## Make test data available
data(ms.data2)
attach(ms.data2)

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

## Detach test data
detach(ms.data3)
# }