mr_count {rimu}

Utility functions for multiple-response objects

Description

These perform diverse useful tasks. mr_count counts the number of levels present for each individual. mr_na sets NA values to something else, ms_na sets them to 0 (ie, not present), mr_drop and ms_drop drop some levels from the object.

Usage

mr_count(x, na.rm = TRUE)
mr_drop(x, levels,...)
ms_drop(x, levels)
mr_na(x, na=TRUE)
ms_na(x)

Arguments

x

mr, or ms object

na.rm

Remove NA first?

levels

character vector of levels to remove

na

Value (TRUE/FALSE) to set NA to

...

not used

Value

An integer vector for mr_count, an object of class mr, or ms for the other two functions

Examples

data(usethnicity)
race<-as.mr(strsplit(as.character(usethnicity$Q5),""))
mtable(race)
race<-mr_drop(race,c(" ","F","G","H"))
mtable(race)

## to keep just specified levels use [
mtable(race[,c("A","D")])

## How many do people identify with
table(mr_count(race))

data(nzbirds)
seenbirds<-as.mr(nzbirds>0)
countbirds<-mr_count(seenbirds)

## How many types of birds were seen
table(countbirds)

data(ethnicity)
ethnicity
mr_na(ethnicity, FALSE)