questionr (version 0.2)

multi.table: One-way frequency table for multiple choices question

Description

This function allows to generate a frequency table from a multiple choices question. The question's answers must be stored in a series of binary variables.

Usage

multi.table(df, true.codes = NULL, weights = NULL)

Arguments

df

data frame with the binary variables

true.codes

optional list of values considered as 'true' for the tabulation

weights

optional weighting vector

Value

• Object of class table.

Details

The function is applied to a series of binary variables, each one corresponding to a choice of the question. For example, if the question is about seen movies among a movies list, each binary variable would correspond to a movie of the list and be true or false depending of the choice of the answer.

By default, only '1' and 'TRUE' as considered as 'true' values fro the binary variables, and counted in the frequency table. It is possible to specify other values to be counted with the true.codes argument.

See Also

cross.multi.table, multi.split, table

Examples

## Sample data frame
sex <- sample(c("Man","Woman"),100,replace=TRUE)
jazz <- sample(c(0,1),100,replace=TRUE)
rock <- sample(c(TRUE, FALSE),100,replace=TRUE)
electronic <- sample(c("Y","N"),100,replace=TRUE)
weights <- runif(100)*2
df <- data.frame(sex,jazz,rock,electronic,weights)
## Frequency table on 'music' variables
multi.table(df[,c("jazz", "rock","electronic")], true.codes=list("Y"))
## Weighted frequency table on 'music' variables
multi.table(df[,c("jazz", "rock","electronic")], true.codes=list("Y"), weights=df$weights)