rpsychi (version 0.3)

groupSummary: Compute summary statistics by group

Description

groupSummary summarize continuous variables by providing means and sample standard deviations and categorical variables by giving numbers and percentages for each group.

Usage

groupSummary(data, group = NULL, digits = 3)

Arguments

data

a data frame contains the variables

group

a character string specify the grouping variable (default NULL)

digits

the specified number of decimal places (default 3)

Value

• Return a data frame containing (1) means and/or numbers, (2) sample standard deviations and/or percentages, (3) numbers of available data for total and each group.

encoding

UTF-8

Details

This function summarize continuous variables by providing means and sample standard deviations and categorical variables by giving numbers and percentages for each group. Missing values (NA) will be stripped before the computation proceeds. If you do not specify group, this function will summarize the variables for total group only.

See Also

ssd

Examples

data(infert)
infert$case <- factor(infert$case, labels=c("control", "case"))
infert$induced <- factor(infert$induced, labels=c("0","1","2 or more"))
infert$spontaneous <- factor(infert$spontaneous, labels=c("0","1","2 or more"))

#continuous and categorical variables
groupSummary(infert, group="case")

#continuous variables only
groupSummary(infert[, c(2,3,7,8, 5)], group="case")

#categorical variables only
groupSummary(infert[, c(1,4, 6, 5)],  group="case")    

#total sample
groupSummary(infert[, c(1,4, 6, 5)])