In elinw/lehmansociology: Tools for Sociology Students Using R

library(lehmansociology)

This document describes how to use the freqency() function from lehmansociology.
This function is designed to produce useful frequency, percent and cumulative data distributions in tabular form for variables treated as factors or ordinal factors.

Basic use

By default the function produces a table containing the frequency and percent.

frequency(chickwts$feed)

You can set freq = FALSE or percent = FALSE to eliminate the respective columns from the results

frequency(chickwts$feed, freq = FALSE)

If apporopriate, you can also request the cumulative frequencies and percents using cumulative.freq = TRUE and cumulative.percent = TRUE. Note that cumulative columns will have a blank Total row.

frequency(chickwts$weight, cumulative.percent = TRUE)

Add a title to the table using the title parameter.

frequency(chickwts$feed, title = "Feed types")

Handling of missing data is done using the useNA parameter. By default useNA = "no" which means that missing data are excluded from the results. useNA = "ifany" will include missing values if they are present. useNA = "always" will add an NA row to the table whether or not there is any missing data.

Printing

Printing is what controls what data R displays either when you type x or print(x) and how it looks.

The function print.frequencytable lets you print the table with different options.
You only need to use this if you want to do something other than the defaults.

It includes the same parameters as print.table() from base r but by default row names are not printed and the values of the variable are left justified. Use row.names = TRUE to print the names or numbers. Use right = TRUE to right justify the values.

Advanced

The function returns an object of class frequencytable.

The object is a list containing:

table
This is the whole table as a dataframe.

frequencies This is the table class for the variable. That is, it is the result from using table(x) with the value of useNA from the frequency() call.

proportions
This is the table class result for prop.table(table(x)).

cum_prop
This is the cumulative proportions as integers. Effectively this is cumsum(prop.table(table(x))).

cum_freq
This is the cumulative frequencies as integers. Effectively cumsum(table(x)).

totrow

This is the row displayed at the bottom. The first element contains the string "Total". Cumulative totals (totrow[3] and totrow[4]) are empty strings.

title

This is the supplied title or an empty string (default).

Once you have the object you can use these separately or modify them using normal R procedures.

elinw/lehmansociology documentation built on May 16, 2019, 3 a.m.