questionr (version 0.7.7)

ggsurvey: Easy ggplot2 with survey objects

Description

A function to facilitate ggplot2 graphs using a survey object. It will initiate a ggplot and map survey weights to the corresponding aesthetic.

Usage

ggsurvey(design = NULL, mapping = NULL, ...)

Arguments

design

A survey design object, usually created with survey::svydesign()

mapping

Default list of aesthetic mappings to use for plot, to be created with ggplot2::aes().

...

Other arguments passed on to methods. Not currently used.

Details

Graphs will be correct as long as only weights are required to compute the graph. However, statistic or geometry requiring correct variance computation (like ggplot2::geom_smooth()) will be statistically incorrect.

Examples

if (require(survey) & require(ggplot2)) {
  data(api)
  dstrat <- svydesign(
    id = ~1, strata = ~stype,
    weights = ~pw, data = apistrat,
    fpc = ~fpc
  )
  ggsurvey(dstrat) +
    aes(x = cnum, y = dnum) +
    geom_count()

  d <- as.data.frame(Titanic)
  dw <- svydesign(ids = ~1, weights = ~Freq, data = d)
  ggsurvey(dw) + 
    aes(x = Class, fill = Survived) + 
    geom_bar(position = "fill")
}