broom (version 0.4.1)

zoo_tidiers: Tidying methods for a zoo object

Description

Tidies zoo (Z's ordered observations) time series objects. zoo objects are not tidy by default because they contain one row for each index and one series per column, rather than one row per observation per series.

Usage

"tidy"(x, ...)

Arguments

x

An object of class "zoo"

...

extra arguments (not used)

Value

tidy returns a data frame with one row for each observation in each series, with the following columns:

index

Index (usually date) for the zoo object

series

Name of the series

value

Value of the observation

Examples

if (require("zoo", quietly = TRUE)) {
    set.seed(1071)

    # data generated as shown in the zoo vignette
    Z.index <- as.Date(sample(12450:12500, 10))
    Z.data <- matrix(rnorm(30), ncol = 3)
    colnames(Z.data) <- c("Aa", "Bb", "Cc")
    Z <- zoo(Z.data, Z.index)
    
    tidy(Z)
    
    if (require("ggplot2", quietly = TRUE)) {
        ggplot(tidy(Z), aes(index, value, color = series)) + geom_line()
        ggplot(tidy(Z), aes(index, value)) + geom_line() +
            facet_wrap(~ series, ncol = 1)

        Zrolled <- rollmean(Z, 5)
        ggplot(tidy(Zrolled), aes(index, value, color = series)) + geom_line()
    }
}

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