Add Quantile Lines to CDF Plot

Add quantile/percentile lines to an existing ggplot cumulative distribution function, typically one created using plotCDF().

Usage

addCDFquantiles(x, p = 0.5, col, lty = "dashed")

Arguments

x

Numeric. A vector of data corresponding to the data used to create the CDF.

p

Numeric. Value(s) between 0-1 for the quantiles. Can be length > 1 if more than one quantile is desired.

col

Color of the lines/quantiles to be added; must be the same length as p.

lty

Character. The line type for the added quantile lines. Can be a single value if the same line type is desired for all quantiles. Can be a vector (the same length as p) if different line types are desired for each quantile.

See also

quantile(), plotCDF(), annotate()

Author

Stu Field, Amanda Hiser

Examples

rdat <- withr::with_seed(101, rnorm(100))
plt <- plotCDF(rdat, main = "Random Gaussian", x.lab = "Data")
plt + addCDFquantiles(rdat, p = 0.9, col = soma_colors2$blue)


# Multiple quantiles can be added in one call if a vector is
# provided for both 'p' and 'col' (and optionally 'lty')
plt +
  addCDFquantiles(rdat,
                  p   = c(0.9, 0.5),
                  col = c(soma_colors2$blue, soma_colors2$teal))


# The same effect can be achieved by adding each quantile individually
plt + addCDFquantiles(rdat, p = 0.9, col = soma_colors2$blue) +
  addCDFquantiles(rdat, p = 0.5, col = soma_colors2$teal) +
  addCDFquantiles(rdat, p = 0.25, col = soma_colors2$pink)