# summarise: Summary statistics for grouped data In Hotelling: Hotelling's T^2 Test and Variants

## Description

Easily get summary statistics for each group present in the data

## Usage

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20``` ```summarise(x, ...) ## Default S3 method: summarise( x, y, stats = list(Mean = mean, Median = median, `Std. Dev.` = sd, N = length), ... ) ## S3 method for class 'formula' summarise( x, data = NULL, stats = list(Mean = mean, Median = median, `Std. Dev.` = sd, N = length), ... ) ## S3 method for class 'data.frame' summarise(x, y, ...) ```

## Arguments

 `x` a matrix of multivariate observations, a list of summary statistics from multivariate observations, a data.frame of multivariate observations, or a formula with a multivariate response on the right hand side, and a grouping variable/factor on the left hand side. `y` a matrix of multivariate observations, a list of summary statistics from multivariate observations, OR a data.frame of multivariate observations `stats` a named list of summary statistics to compute on each variable in each group. Note 1: Quantiles are not supported yet because I can't think of a good way to handle the extra arguments. Help welcome. Note 2: The names of the elements in the list are used to label the columns of the output. They probably should be unique. `data` a data.frame containing the variables used in a formula `...` other arguments such as another matrix of multivariate observations: see `summarise.default`, or a data to be used with a formula: see `summarise.formula`

## Methods (by class)

• `default`: Summary statistics for grouped data

• `formula`: Summary statistics for grouped data

• `data.frame`: Summary statistics for grouped data

## Examples

 ``` 1 2 3 4 5 6 7 8 9 10 11``` ```data(container.df) split.data = split(container.df[,-1],container.df\$gp) x = split.data[[1]] y = split.data[[2]] summarise(x, y) ## Using the formula interface data(container.df) summarise(gp~., data = container.df) summarise(gp~Al+Ti, data = container.df) ```

Hotelling documentation built on Sept. 9, 2021, 9:09 a.m.