labelr (version 0.1.9)

with_both_labs: Overlay Variable Name and Value Labels Onto Arbitrary R Function Calls

Description

with_both_labs instructs R function calls to swap in variable name labels for column names AND variable value labels for variable values in the objects they return or side effects they produce.

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

Usage

with_both_labs(data, ...)
wbl(data, ...)

Value

the value of the evaluated expr, with name and value labels substituted for variable (column) names and values, respectively.

Arguments

data

a data.frame with variable name labels and variable value labels.

...

an additional expression passed to dots (quotes and dollar signs are not needed or permitted).

Details

with_both_labs (see also alias wbl) is intended for interactive use. With it, you pass a name-labeled data.frame followed, followed by a comma, followed by an unquoted R expression (function call) to be evaluated within that data.frame, and both name and value labels will be substituted for their corresponding, respective column names and variable value in any returned object or side effects. Your function call (expression) should refer to columns of the data.frame passed via your data argument, NOT their name labels, as the intent is to allow you to pass functions in terms of the (typically much more concise and familiar) column names while having the results displayed / presented in terms of the more informative (but more verbose and typically non-standard) name labels. See examples.

Caution 1: Typically, with_name_labs will be more appropriate than with_both_labs, since conversion of variables' values to their corresponding labels frequently entails conversion from numeric to character.

Caution 2: with_both_labs is a rudimentary function that leverages basic regular expressions and eval(parse(text=)) to substitute name labels for variable names behind the scenes. It appears to be robust to a range of the most common commands and operators (e.g., formula or modeling operators, such as ~ , * , +, :, =, and |). However, it is intended strictly as a convenience for relatively simple, interactive, single-line-expression, data exploration, description, or simple model-fitting use cases. It is expressly NOT intended for: (1) multi-step workflows or pipes, (2) expressions that require or make reference to objects existing outside the supplied data.frame, or (3) data management operations aimed at modifying the supplied data.frame. Again, see the examples for the types of expressions/use cases envisioned.

Examples

# assign mtcars to new data.frame mt2
mt2 <- mtcars

# add name labs
mt2 <- add_name_labs(mt2,
  name.labs = c(
    "mpg" = "Miles/(US) gallon",
    "cyl" = "Number of cylinders",
    "disp" = "Displacement (cu.in.)",
    "hp" = "Gross horsepower",
    "drat" = "Rear axle ratio",
    "wt" = "Weight (1000 lbs)",
    "qsec" = "1/4 mile time",
    "vs" = "Engine (0 = V-shaped, 1 = straight)",
    "am" = "Transmission (0 = automatic, 1 = manual)",
    "gear" = "Number of forward gears",
    "carb" = "Number of carburetors"
  )
)


# add many-to-1 value labels
mt2 <- add_m1_lab(
  data = mt2,
  vars = "gear",
  vals = 4:5,
  lab = "4+"
)

# add many-to-1 value labels
mt2 <- add_val_labs(
  data = mt2,
  vars = "am",
  vals = c(0, 1),
  lab = c("auto", "man")
)
with_both_labs(mt2, t.test(mpg ~ am))
with_both_labs(mt2, lm(mpg ~ am))
with_both_labs(mt2, xtabs(~gear))
xtabs(~ mt2$gear)