~ Function: wideToLong (or reshapeWideToLong) ~

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Description

This function reshapes a data frame in 'wide' format (repeated measurements in separate column) into a data frame in 'long' format (repeated measurements in the same columns).

Usage

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wideToLong(trajWide,times=1:(ncol(trajWide)-1))
reshapeWideToLong(trajWide,times=1:(ncol(trajWide)-1))

Arguments

trajWide

[data.frame]: a data frame in 'wide' format (repeated measurements in separate column). The first column has to be the individual indentier. All the other column should be the trajectories.

times

[vector(numeric)]: specification of the times at wich the longitudinal data have been measured (like ages, year, month). If times is missing, it takes the value 1:(ncol(trajWide)-1).

Details

This function reshapes a data frame in 'wide' format (repeated measurements in separe column) into a data frame in 'long' format (repeated measurements in the same columns). The first column has to be the individual indentier. All the other column should be the trajectories. The missing values are removed in long format.

Value

A data frame in 'long' format.

Author(s)

Christophe Genolini

See Also

longToWide, reshape.

Examples

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df3 <- data.frame(id = LETTERS[rep(1:4)], sex=c("H","F","H","F"),
    v1=rnorm(4),v2=rnorm(4),w1=rnorm(4),w2=rnorm(4))

wideToLong(df3[,c(1,3,4)])
wideToLong(df3[,c(1,5,6)])
wideToLong(df3[,c(1,3:6)])
wideToLong(df3[,c(1,3:6)],times=c(1,2,4,8))

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