desc_statby: Descriptive statistics by groups

View source: R/desc_statby.R

desc_statbyR Documentation

Descriptive statistics by groups

Description

Computes descriptive statistics by groups for a measure variable.

Usage

desc_statby(data, measure.var, grps, ci = 0.95)

Arguments

data

a data frame.

measure.var

the name of a column containing the variable to be summarized.

grps

a character vector containing grouping variables; e.g.: grps = c("grp1", "grp2")

ci

the percent range of the confidence interval (default is 0.95).

Value

A data frame containing descriptive statistics, such as:

  • length: the number of elements in each group

  • min: minimum

  • max: maximum

  • median: median

  • mean: mean

  • iqr: interquartile range

  • mad: median absolute deviation (see ?MAD)

  • sd: standard deviation of the sample

  • se: standard error of the mean. It's calculated as the sample standard deviation divided by the root of the sample size.

  • ci: confidence interval of the mean

  • range: the range = max - min

  • cv: coefficient of variation, sd/mean

  • var: variance, sd^2

Examples

# Load data
data("ToothGrowth")

# Descriptive statistics
res <- desc_statby(ToothGrowth, measure.var = "len",
   grps = c("dose", "supp"))
head(res[, 1:10])


kassambara/ggpubr documentation built on Feb. 15, 2023, 4:09 a.m.