labelr (version 0.1.9)

add_lab_dumm1: Add A Dummy Variable for Each Value Label of a Single Variable

Description

For a single value-labeled data.frame column, create a dummy (aka indicator) variable for each of that column's unique value labels.

Usage

add_lab_dumm1(
  data,
  var,
  simple.names = TRUE,
  sep = "_",
  prefix.length = 4,
  suffix.length = 7
)
ald1(
  data,
  var,
  simple.names = TRUE,
  sep = "_",
  prefix.length = 4,
  suffix.length = 7
)

Value

A data.frame with dummy variables added for all value labels of the value-labeled column supplied to the var argument.

Arguments

data

a data.frame with at least one value-labeled variable (column).

var

the unquoted name of the value-labeled variable (column) from which dummy variable columns will be generated.

simple.names

if TRUE (the default), dummy variable names will be the parent variable's name, followed by the sep separator (see above), followed by an automatically generated numerical id suffix. For example two dummy variable columns created from value-labeled column "tacos" using the sep argument of "." would be given the respective names "tacos.1" and "tacos.2").

sep

the separator character to use in constructing dummy variable column names (appears between the dummy variable name prefix and suffix).

prefix.length

(NOTE: This argument is ignored if simple.names = TRUE). A 1L integer indicating the number of leading characters of the parent column's name to use in constructing dummy variable column names. For example, if simple.names = FALSE, if prefix.length = 2, and for a parent column named "tacos", each derivative dummy variable column name will begin with the prefix string "ta," (corresponding to the first two characters of "tacos"), followed by the sep separator character (see sep param, above), followed by the suffix string (see suffix.length param, below).

suffix.length

(NOTE: This argument is ignored if simple.names = TRUE). A 1L integer indicating the number of leading characters of each variable value label to use use in constructing dummy variable column names. For example, consider the following setup: parent column name is "tacos"; prefix.length = 3; sep = "_", and suffix.length = 2. In this case, if simple.names = FALSE, then a dummy variable column named "tac_so" would be created to represent those values of the tacos" column that have the value label "soft" (because "tac" are the first three letters of the parent column name, the separator is ".", and "so" are the first two characters in "soft").

Details

Note 1: add_lab_dumm1 is a variant of add_lab_dummies that allows you to specify only one var to label at a time but that allows you to pass its name without quoting.

Note 2: ald1 is a compact alias for add_lab_dumm1: they do the same thing, and the former is easier to type

Note 3: If the default of simple.names is used, dummy variable column names will be the "parent" variable column name, followed by a separator character (by default, "_"), followed by a number, to differentiate each dummy variable from the others in the set. If one of the automatically generated dummy column names is already "taken" by a pre-existing data.frame column, an error to this effect will be thrown. If simple.names = FALSE, then prefix.length and suffix.length arguments will be used to construct dummy variable column names using the leading characters of the parent column name, followed by a separator character, followed by the leading characters of the value label. (white spaces in the value label will be replaced with the separator character).

Note 4: This command is intended exclusively for interactive use. In particular, the var argument must be the literal name of a single variable (column) found in the supplied data.frame and may NOT be, e.g., the name of a character vector that contains the variable (column name) of interest. If you wish to supply a character vector with the names of variables (columns) of interest, use add_lab_dummies().

Examples

# one variable at a time, mtcars
df <- mtcars

# now, add 1-to-1 value labels
df <- add_val_labs(
  data = df,
  vars = "am",
  vals = c(0, 1),
  labs = c("automatic", "manual")
)

df <- add_val_labs(
  data = df,
  vars = "carb",
  vals = c(1, 2, 3, 4, 6, 8),
  labs = c(
    "1-carb", "2-carbs",
    "3-carbs", "4-carbs",
    "6-carbs", "8-carbs"
  )
)

# var arg can be unquoted if using add_val1()
# note that this is not add_val_labs(); add_val1() has "var" (not "vars) arg
df <- add_val1(
  data = df,
  var = cyl, # note, "var," not "vars" arg
  vals = c(4, 6, 8),
  labs = c(
    "four-cyl",
    "six-cyl",
    "eight-cyl"
  )
)

# add many-to-1 value labels
df <- add_m1_lab(
  data = df,
  vars = "gear",
  vals = 4:5,
  lab = "4+"
)

# add quartile-based numerical range value labels
df <- add_quant_labs(
  data = df,
  vars = "disp",
  qtiles = 4
)

# add "pretty" cut-based numerical range value labels
(mpg_bins <- pretty(range(df$mpg, na.rm = TRUE)))

df <- add_quant_labs(data = df, vars = "mpg", vals = mpg_bins)

# add dummy variables for value labels of column "mpg"
df1 <- add_lab_dumm1(df,
  var = mpg,
  simple.names = TRUE
) # simple.names = TRUE is default
df1

# add dummy variables for value labels of column "am"
df2 <- add_lab_dumm1(df, am,
  sep = ".", simple.names = FALSE,
  prefix.length = 2, suffix.length = 6
)
df2