Shows the results of stacked frequencies (such as likert scales) as HTML table. This function is useful when several items with identical scale/categories should be printed as table to compare their distributions (e.g. when plotting scales like SF, Barthel-Index, Quality-of-Life-scales etc.).

tab_stackfrq(
items,
weight.by = NULL,
title = NULL,
var.labels = NULL,
value.labels = NULL,
wrap.labels = 20,
sort.frq = NULL,
alternate.rows = FALSE,
digits = 2,
string.total = "N",
string.na = "NA",
show.n = FALSE,
show.total = FALSE,
show.na = FALSE,
show.skew = FALSE,
show.kurtosis = FALSE,
digits.stats = 2,
file = NULL,
encoding = NULL,
CSS = NULL,
use.viewer = TRUE,
remove.spaces = TRUE
)

Arguments

items

Data frame, or a grouped data frame, with each column representing one item.

weight.by

Vector of weights that will be applied to weight all cases. Must be a vector of same length as the input vector. Default is NULL, so no weights are used.

title

Character vector with table caption(s) resp. footnote(s). For tab_df(), must be a character of length 1; for tab_dfs(), a character vector of same length as x (i.e. one title or footnote per data frame).

var.labels

Character vector with variable names, which will be used to label variables in the output.

value.labels

Character vector (or list of character vectors) with value labels of the supplied variables, which will be used to label variable values in the output.

wrap.labels

Numeric, determines how many chars of the value, variable or axis labels are displayed in one line and when a line break is inserted.

sort.frq

logical, indicates whether the items should be ordered by by highest count of first or last category of items.

• Use "first.asc" to order ascending by lowest count of first category,

• "first.desc" to order descending by lowest count of first category,

• "last.asc" to order ascending by lowest count of last category,

• "last.desc" to order descending by lowest count of last category,

• or NULL (default) for no sorting.

alternate.rows

Logical, if TRUE, rows are printed in alternatig colors (white and light grey by default).

digits

Numeric, amount of digits after decimal point when rounding values.

string.total

label for the total N column.

string.na

label for the missing column/row.

show.n

logical, if TRUE, adds total number of cases for each group or category to the labels.

show.total

logical, if TRUE, an additional column with each item's total N is printed.

show.na

logical, if TRUE, NA's (missing values) are added to the output.

show.skew

logical, if TRUE, an additional column with each item's skewness is printed. The skewness is retrieved from the describe-function of the psych-package.

show.kurtosis

Logical, if TRUE, the kurtosis for each item will also be shown (see kurtosi and describe in the psych-package for more details.

digits.stats

amount of digits for rounding the skewness and kurtosis valuess. Default is 2, i.e. skewness and kurtosis values have 2 digits after decimal point.

file

Destination file, if the output should be saved as file. If NULL (default), the output will be saved as temporary file and opened either in the IDE's viewer pane or the default web browser.

encoding

Character vector, indicating the charset encoding used for variable and value labels. Default is "UTF-8". For Windows Systems, encoding = "Windows-1252" might be necessary for proper display of special characters.

CSS

A list with user-defined style-sheet-definitions, according to the official CSS syntax. See 'Details' or this package-vignette.

use.viewer

Logical, if TRUE, the HTML table is shown in the IDE's viewer pane. If FALSE or no viewer available, the HTML table is opened in a web browser.

remove.spaces

Logical, if TRUE, leading spaces are removed from all lines in the final string that contains the html-data. Use this, if you want to remove parantheses for html-tags. The html-source may look less pretty, but it may help when exporting html-tables to office tools.

Value

Invisibly returns

• the web page style sheet (page.style),

• the web page content (page.content),

• the complete html-output (page.complete) and

• the html-table with inline-css for use with knitr (knitr)

for further use.

Examples

# -------------------------------
# random sample
# -------------------------------
# prepare data for 4-category likert scale, 5 items
likert_4 <- data.frame(
as.factor(sample(1:4, 500, replace = TRUE, prob = c(0.2, 0.3, 0.1, 0.4))),
as.factor(sample(1:4, 500, replace = TRUE, prob = c(0.5, 0.25, 0.15, 0.1))),
as.factor(sample(1:4, 500, replace = TRUE, prob = c(0.25, 0.1, 0.4, 0.25))),
as.factor(sample(1:4, 500, replace = TRUE, prob = c(0.1, 0.4, 0.4, 0.1))),
as.factor(sample(1:4, 500, replace = TRUE, prob = c(0.35, 0.25, 0.15, 0.25)))
)

# create labels
levels_4 <- c("Independent", "Slightly dependent",
"Dependent", "Severely dependent")

# create item labels
items <- c("Q1", "Q2", "Q3", "Q4", "Q5")

# plot stacked frequencies of 5 (ordered) item-scales
if (FALSE) {
if (interactive()) {
tab_stackfrq(likert_4, value.labels = levels_4, var.labels = items)

# -------------------------------
# Data from the EUROFAMCARE sample dataset
#  Auto-detection of labels
# -------------------------------
data(efc)
# recveive first item of COPE-index scale
start <- which(colnames(efc) == "c82cop1")
# recveive first item of COPE-index scale
end <- which(colnames(efc) == "c90cop9")

tab_stackfrq(efc[, c(start:end)], alternate.rows = TRUE)

tab_stackfrq(efc[, c(start:end)], alternate.rows = TRUE,
show.n = TRUE, show.na = TRUE)

# --------------------------------
# User defined style sheet
# --------------------------------
tab_stackfrq(efc[, c(start:end)], alternate.rows = TRUE,
show.total = TRUE, show.skew = TRUE, show.kurtosis = TRUE,
CSS = list(css.ncol = "border-left:1px dotted black;",
css.summary = "font-style:italic;"))
}
}