labelr (version 0.1.9)

add_val_labs: Add or Modify a Variable's Value Labels

Description

Add variable value-specific, descriptive value labels to a data.frame.

Usage

add_val_labs(
  data,
  vars,
  vals,
  labs,
  partial = FALSE,
  not.vars = NULL,
  max.unique.vals = 10,
  init = FALSE
)
avl(
  data,
  vars,
  vals,
  labs,
  partial = FALSE,
  not.vars = NULL,
  max.unique.vals = 10,
  init = FALSE
)

Value

A data.frame, with new variable value labels added (call get_val_labs to see them), other provisional/default labelr label information added, and previous user-added labelr label information preserved.

Arguments

data

a data.frame.

vars

a character vector that corresponds to the name(s) of one or more variables to which value labels will be added.

vals

a vector of distinct values of the actual variable, each of which is to be associated with a label supplied to the labs argument in the same positional order (e.g., vals = c(1,0), labs = c("manual", "automatic") will associate lab "manual" with val 1 and lab "automatic" with val 0.). Note: NA and other "irregular" (e.g., NaN, Inf) values all are automatically assigned the label "NA", and this cannot be overridden. Note that you do not need to specify all unique vals of var, and you can supply value labels incrementally, one (or a few, or all) unique vals of var at a time. Once you've added the value label, it is bound to that value until you drop it (see drop_val_labs) or some other action (intentional or otherwise) strips or overwrites it.

labs

a character vector of distinct label values, each of which is to be associated with exactly one corresponding distinct value (vals argument element) of the variable(s) identified in the vars argument. The order of labs argument must match that of vals argument entries (e.g., if a three-element vector of values is supplied to vals, then a three-element vector of proposed labels must be supplied to labs, and the first value of vals will get the first label of labs, the second value of vals will get the second label of labs, etc.). Note: NA and other "irregular" (e.g., NaN, Inf) values are automatically assigned the label "NA" and may not be assigned another label.

partial

To apply the same value labeling scheme to many variables at once, you can provide those variable names explicitly (e.g., vars = c("x1","x2", "x3") or vars = paste0("x", 1:3), or you can provide a substring only and set partial = TRUE (default is FALSE). For example, to apply the same labeling scheme to vars "x1", "x2" ... sequentially through "x10", you could use vars = c("x"), along with partial = TRUE. Be careful with this, as it also will attempt to apply the scheme to "sex" or "tax.bracket", etc.

not.vars

use of the partial argument can result in situations where you inadvertently attempt to value-label a variable. For example, if vars="x" and partial=TRUE, then add_val_labs will attempt to label not only "x1", "x2","x3", and "x4", but also "sex", "tax.bracket.", and other "x"-containing variable names. Use of not.vars allows you to indicate variables that match your vars argument that you do not wish to attempt to value-label. Note that not.vars gets priority: setting vars="x", partial=TRUE, and not.vars="x" is tantamount to telling add_val_labs() that you actually do not wish to label any of the variables that you specified in vars, resulting in no variables receiving value labels.

max.unique.vals

add_val_labs() will not assign value labels to non- integer (i.e., decimal-having) numeric variables. The max.unique.vals argument further constrains the variables that may receive value labels to those whose total unique values do not exceed the integer value supplied to this argument. Note that labelr sets a hard ceiling of 5000 on the total number of unique value labels that any variable is permitted to have under any circumstance, as labelr is primarily intended for interactive use with moderately-sized (<=~1M-row) data.frames.

init

assign placeholder labels for variables that lack decimals and meet the max.unique.vals threshold.

Details

Note: avl is a compact alias for add_val_labs: they do the same thing, and the former is easier to type

add_val_labs is intended for associating value labels with binary, nominal, or ordinal (e.g., integer) variables, where each of a limited number of distinct values is to be associated one-to-one with a distinct value label. To assign labels to ranges of numerical variables, see add_quant_labs (or add_quant1). To apply the same label to multiple distinct values of a variable, see add_m1_lab or add1m1.

add_val_labs works with other labelr functions (e.g., add_val1, drop_val_labs, get_val_labs, use_val_labs, add_lab_cols) to facilitate the creation, accessing, modification, use, or deletion of variable value labels.

When using add_val_labs or add_val1, each distinct variable value can receive one and only one value label, and for any given variable, each unique label can be assigned to only one unique value (e.g., mtcars$gear==3 and mtcars$gear==4 cannot both share a single "3 or 4 gears" label: each of these two distinct values must have its own label). This latter constraint may be relaxed by using add_m1_lab.

If partial = TRUE, add_val_labs will apply the specified labeling scheme to all variables that contain a key variable name substring of interest (supplied to the vars argument), which may be one or more variables found in the data.frame (see Example #2).

Examples

# Example #1 - mtcars example, one variable at a time
# one variable at a time, mtcars
df <- mtcars
# now, add 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"
  )
)

df <- add_val_labs(
  data = df,
  vars = "gear",
  vals = c(3, 4),
  labs = c(
    "3-speed",
    "4-speed"
  )
)

# Oops, we forgot 5-speeds; let's finish the job.
df <- add_val_labs(
  data = df,
  vars = "gear",
  vals = 5,
  labs = "5-speed"
)

head(use_val_labs(df), 3) # they're there

# Example #2 - (Fake) Likert Data
# add val labs to multiple variables at once
# make a "Likert"-type fake data set to demo
# note, by default, add_val_labs() "vars" arg will do partial matching
# in this case, we catch all vars with "x" in their name
set.seed(272)
dflik <- make_likert_data(scale = 1:7)
vals2label <- 1:7
labs2use <- c(
  "VSD",
  "SD",
  "D",
  "N",
  "A",
  "SA",
  "VSA"
)

dflik <- add_val_labs(
  data = dflik, vars = c("x", "y3"), # note the vars args
  vals = vals2label,
  labs = labs2use,
  partial = TRUE
)

# note, all "x" vars get the labs, as does "y3"
# see vars = args above
lik1 <- use_val_labs(dflik)
head(lik1)
# keep a copy
dflik_conv <- use_val_labs(dflik)
head(dflik_conv, 3)