descTab: Format Descriptive Table

In Cogitos/predata: Predata load data and explore them

Description

Compute and format a data frame into a table suitable for publication with means and standard deviations into parentheses.

Usage

descTab(data, grp = NULL, frq = NULL, n = T)

Arguments

data	A data frame with only the columns to use to compute the mean and the standard deviation as well as the column to use to compute by group.
grp	Optional, the name of the column to use to compute by group.
frq	Optional, the name of the column to use to compute frequency tables, typically for gender. Default to NULL.
n	Optional, logical value to compute or not the number of observations per group. Default to TRUE.

Value

Return a data frame by group (if any) with the mean and the standard deviation into parentheses.

Author(s)

Guillaume T. Vallet [e-mail], University of Montreal (Canada)

Examples

# Create data frame faking a group of young and elderly adults.
data = rbind(
     data.frame(subject=1:10,
         age=round(rnorm(10, mean=23, sd=1.5), 0),
         education=round(rnorm(10, mean=15, sd=2.1), 0),
         sex=sample(1:2, size=10, replace=T, prob=c(.6,.4)),
         group='young'),
     data.frame(subject=11:20,
         age=round(rnorm(10, mean=71, sd=2), 0),
         education=round(rnorm(10, mean=14, sd=1.9), 0),
         sex=sample(1:2, size=10, replace=T, prob=c(.4,.6)),
         group='elderly'))

 # Compute the mean and standard deviation of their age and
 #   education. Exclude the subject column to run the function.
descTab(data[,-1], grp='group')

# Addition of the frequency table for the gender
descTab(data[,-1], grp='group', frq='sex')

# Improve the label of the gender factor
data$sex = factor(data$sex, labels=c('M','F'))
descTab(data[,-1], grp='group', frq='sex')

Cogitos/predata documentation built on May 6, 2019, 12:21 p.m.