frq: Frequency table of labelled variables

In sjPlot/sjmisc: Data and Variable Transformation Functions

Frequency table of labelled variables

Description

This function returns a frequency table of labelled vectors, as data frame.

Usage

frq(
  x,
  ...,
  sort.frq = c("none", "asc", "desc"),
  weights = NULL,
  auto.grp = NULL,
  show.strings = TRUE,
  show.na = TRUE,
  grp.strings = NULL,
  min.frq = 0,
  out = c("txt", "viewer", "browser"),
  title = NULL,
  encoding = "UTF-8",
  file = NULL
)

Arguments

x	A vector or a data frame. May also be a grouped data frame (see 'Note' and 'Examples').
...	Optional, unquoted names of variables that should be selected for further processing. Required, if x is a data frame (and no vector) and only selected variables from x should be processed. You may also use functions like : or tidyselect's select-helpers. See 'Examples' or package-vignette.
sort.frq	Determines whether categories should be sorted according to their frequencies or not. Default is "none", so categories are not sorted by frequency. Use "asc" or "desc" for sorting categories ascending or descending order.
weights	Bare name, or name as string, of a variable in x that indicates the vector of weights, which will be applied to weight all observations. Default is NULL, so no weights are used.
auto.grp	Numeric value, indicating the minimum amount of unique values in a variable, at which automatic grouping into smaller units is done (see group_var). Default value for auto.group is NULL, i.e. auto-grouping is off.
show.strings	Logical, if TRUE, frequency tables for character vectors will not be printed. This is useful when printing frequency tables of all variables from a data frame, and due to computational reasons character vectors should not be printed.
show.na	Logical, or "auto". If TRUE, the output always contains information on missing values, even if variables have no missing values. If FALSE, information on missing values are removed from the output. If show.na = "auto", information on missing values is only shown when variables actually have missing values, else it's not shown.
grp.strings	Numeric, if not NULL, groups string values in character vectors, based on their similarity. See group_str and str_find for details on grouping, and their precision-argument to get more details on the distance of strings to be treated as equal.
min.frq	Numeric, indicating the minimum frequency for which a value will be shown in the output (except for the missing values, prevailing show.na). Default value for min.frq is 0, so all value frequencies are shown. All values or categories that have less than min.frq occurences in the data will be summarized in a "n < 100" category.
out	Character vector, indicating whether the results should be printed to console (out = "txt") or as HTML-table in the viewer-pane (out = "viewer") or browser (out = "browser").
title	String, will be used as alternative title to the variable label. If x is a grouped data frame, title must be a vector of same length as groups.
encoding	Character vector, indicating the charset encoding used for variable and value labels. Default is "UTF-8". Only used when out is not "txt".
file	Destination file, if the output should be saved as file. Only used when out is not "txt".

Details

The ...-argument not only accepts variable names or expressions from select-helpers. You can also use logical conditions, math operations, or combining variables to produce "crosstables". See 'Examples' for more details.

Value

A list of data frames with values, value labels, frequencies, raw, valid and cumulative percentages of x.

Note

x may also be a grouped data frame (see group_by) with up to two grouping variables. Frequency tables are created for each subgroup then.

The print()-method adds a table header with information on the variable label, variable type, total and valid N, and mean and standard deviations. Mean and SD are always printed, even for categorical variables (factors) or character vectors. In this case, values are coerced into numeric vector to calculate the summary statistics.

To print tables in markdown or HTML format, use print_md() or print_html().

See Also

flat_table for labelled (proportional) tables.

Examples

# simple vector
data(efc)
frq(efc$e42dep)

# with grouped data frames, in a pipe
library(dplyr)
efc %>%
  group_by(e16sex, c172code) %>%
  frq(e42dep)

# show only categories with a minimal amount of frequencies
frq(mtcars$gear)

frq(mtcars$gear, min.frq = 10)

frq(mtcars$gear, min.frq = 15)

# with select-helpers: all variables from the COPE-Index
# (which all have a "cop" in their name)
frq(efc, contains("cop"))

# all variables from column "c161sex" to column "c175empl"
frq(efc, c161sex:c175empl)

# for non-labelled data, variable name is printed,
# and "label" column is removed from output
data(iris)
frq(iris, Species)

# also works on grouped data frames
efc %>%
  group_by(c172code) %>%
  frq(is.na(nur_pst))

# group variables with large range and with weights
efc$weights <- abs(rnorm(n = nrow(efc), mean = 1, sd = .5))
frq(efc, c160age, auto.grp = 5, weights = weights)

# different weight options
frq(efc, c172code, weights = weights)
frq(efc, c172code, weights = "weights")
frq(efc, c172code, weights = efc$weights)
frq(efc$c172code, weights = efc$weights)

# group string values
dummy <- efc[1:50, 3, drop = FALSE]
dummy$words <- sample(
  c("Hello", "Helo", "Hole", "Apple", "Ape",
    "New", "Old", "System", "Systemic"),
  size = nrow(dummy),
  replace = TRUE
)

frq(dummy)
frq(dummy, grp.strings = 2)

#### other expressions than variables

# logical conditions
frq(mtcars, cyl ==6)

frq(efc, is.na(nur_pst), contains("cop"))

iris %>%
  frq(starts_with("Petal"), Sepal.Length > 5)

# computation of variables "on the fly"
frq(mtcars, (gear + carb) / cyl)

# crosstables
set.seed(123)
d <- data.frame(
  var_x = sample(letters[1:3], size = 30, replace = TRUE),
  var_y = sample(1:2, size = 30, replace = TRUE),
  var_z = sample(LETTERS[8:10], size = 30, replace = TRUE)
)
table(d$var_x, d$var_z)
frq(d, paste0(var_x, var_z))
frq(d, paste0(var_x, var_y, var_z))

sjPlot/sjmisc documentation built on May 15, 2024, 6:43 p.m.