to.long {MethComp}

Functions to convert between long and wide representations of data

Description

These functions are merely wrappers for reshape. Given the complicated syntax of reshape and the particularly simple structure of this problem, the functions facilitate the conversion enormously.

Usage

to.long(data, vars)

Arguments

data

A Meth object.

vars

The variables representing measurements by different methods. Either a character vector of names, or a numerical vector with the number of the variables in the dataframe.

Details

If data represents method comparisons with exchangeable replicates within method, the transformation to wide format does not necessarily make sense.

Value

A data frame with the reshaped data

Examples

data( milk )
str( milk )
mw <- to.wide( milk )
str( mw )
( mw <- subset( mw, as.integer(item) < 3 ) )
to.long( mw, 3:4 )