broom (version 0.4.1)

data.frame_tidiers: Tidiers for data.frame objects

Description

These perform tidy summaries of data.frame objects. tidy produces summary statistics about each column, while glance simply reports the number of rows and columns. Note that augment.data.frame will throw an error.

Usage

"tidy"(x, ...)
"augment"(x, data, ...)
"glance"(x, ...)

Arguments

x

A data.frame

...

extra arguments: for tidy, these are passed on to describe from psych package

data

data, not used

Value

tidy.data.frame produces a data frame with one row per original column, containing summary statistics of each:

column

name of original column

n

Number of valid (non-NA) values

mean

mean

sd

standard deviation

median

median

trimmed

trimmed mean, with trim defaulting to .1

mad

median absolute deviation (from the median)

min

minimum value

max

maximum value

range

range

skew

skew

kurtosis

kurtosis

se

standard error

glance returns a one-row data.frame with

nrow

number of rows

ncol

number of columns

complete.obs

number of rows that have no missing values

na.fraction

fraction of values across all rows and columns that are missing

Details

The tidy method calls the psych method describe directly to produce its per-columns summary statistics.

See Also

describe

Examples

td <- tidy(mtcars)
td

glance(mtcars)

library(ggplot2)
# compare mean and standard deviation
ggplot(td, aes(mean, sd)) + geom_point() +
     geom_text(aes(label = column), hjust = 1, vjust = 1) +
     scale_x_log10() + scale_y_log10() + geom_abline()