labelr (version 0.1.9)

add_quant_labs: Associate Numerical Threshold-based Value Labels with Select Numerical Variables

Description

Add variable-specific value labels based on threshold cuts of a numerical variable.

Usage

add_quant_labs(
  data,
  vars,
  qtiles = NULL,
  vals = NULL,
  labs = NULL,
  partial = FALSE,
  not.vars = NULL
)
aql(
  data,
  vars,
  qtiles = NULL,
  vals = NULL,
  labs = NULL,
  partial = FALSE,
  not.vars = NULL
)

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 threshold-based labels will be added.

qtiles

the number of quantile categories to employ (e.g., 4 would indicate quartiles, 5 would indicate quintiles, 10 for deciles, etc.). If NULL, vals must be non-NULL.

vals

one more values of vars that will define range cutpoints, such that all values at or below a given number and above the preceding val will be treated as part of the same numerical range for labeling purposes. If NULL, qtiles must be non-NULL.

labs

a character vector of distinct labels to identify the quantiles. If left NULL, convention "q" + quantile (e.g., "q10") will be used for qtile-based labels (i.e., if qtiles arg is non-NULL), and convention "<=" + val will be used for vals argument-based labels (i.e., if vals arg is non-NULL). Note that the labels "NA" and "Other" are (non-case-sensitively) reserved and may not be user-supplied.

partial

To apply the same numerical 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. (See not.vars argument for a way to mitigate this.)

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_quant_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.

Details

Note: aql is a compact alias for add_quant_labs: they do the same thing, and the former is easier to type.

Numerical variables that feature decimals or large numbers of distinct values are not eligible to receive conventional value labels. add_quant_labs allows one to label such variables according to user-supplied value thresholds (i.e., cutpoints) OR quantile membership, Thus, unlike value labels added with add_val_labs (and add_val1), add_quant_labs (and add_quant1) will apply the same value label to all values that fall within the numerical value range defined by each threshold (cutpoint). For still another value-labeling approach, see add_m1_lab (and add1m1).

Note: Quantity labels cannot be added incrementally through repeated calls to add_quant_labs: each new call will overwrite all value labels applied to the specified vars in any previous add_quant_labs calls. This is in contrast to add_val_labs (which allows for incremental value-labeling) and add_m1_lab (which requires incremental value-labeling).

Examples

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

# label variable "mpg" in terms of 5 quintiles
df <- add_quant_labs(data = df, vars = "mpg", qtiles = 5)

# label variable "disp" in terms of "pretty" cutpoints
vals2use <- pretty(c(min(df$disp), max(df$disp)))[-1] # establish cutpoints
df <- add_quant_labs(data = df, vars = "disp", vals = vals2use)
df_labson <- use_val_labs(df)
head(df_labson)