plotNormalHistogram: Histogram with a normal curve

In rcompanion: Functions to Support Extension Education Program Evaluation

Histogram with a normal curve

Description

Produces a histogram for a vector of values and adds a normal curve with the same mean and standard deviation. The plot can be used to quickly compare the distribution of data to a normal distribution.

Usage

plotNormalHistogram(
  x,
  prob = FALSE,
  col = "gray",
  main = "",
  linecol = "blue",
  lwd = 2,
  length = 1000,
  ...
)

Arguments

x	A vector of values.
prob	If FALSE, then counts are displayed in the histogram. If TRUE, then the density is shown.
col	The color of the histogram bars.
main	The title displayed for the plot.
linecol	The color of the line in the plot.
lwd	The width of the line in the plot.
length	The number of points in the line in the plot.
...	Other arguments passed to hist.

Details

The function relies on the hist function. The normal curve has the same mean and standard deviation as the values in the vector.

Value

Produces a plot. Returns nothing.

Author(s)

Salvatore Mangiafico, [e-mail]

References

https://rcompanion.org/handbook/I_01.html

See Also

plotNormalDensity, plotDensityHistogram

Examples

### Plot of residuals from a model fit with lm
data(Catbus)
model = lm(Steps ~ Gender + Teacher,
           data = Catbus)
 plotNormalHistogram(residuals(model))          

rcompanion documentation built on May 29, 2024, 8:42 a.m.