dplyr (version 0.3)

summarise: Summarise multiple values to a single value.

Description

Summarise multiple values to a single value.

Usage

summarise(.data, ...)
summarise_(.data, ..., .dots)
summarize(.data, ...)
summarize_(.data, ..., .dots)

Arguments

.data

A tbl. All main verbs are S3 generics and provide methods for tbl_df, tbl_dt and tbl_sql.

...

Name-value pairs of summary functions like min(), mean(), max() etc.

.dots

Used to work around non-standard evaluation. See vignette("nse") for details.

Value

An object of the same class as .data. One grouping level will be dropped.

Data frame row names are silently dropped. To preserve, convert to an explicit variable.

See Also

Other single.table.verbs: arrange, arrange_; filter, filter_; mutate, mutate_, transmute, transmute_; rename, rename_, select, select_; slice, slice_

Examples

summarise(mtcars, mean(disp))
summarise(group_by(mtcars, cyl), mean(disp))

summarise(group_by(mtcars, cyl), m = mean(disp), sd = sd(disp))