How do I change the kernel bandwidth used in a density plot in R


stat_geom utilises the adjust argument to apply a multiplier to the optimal bandwidth that ggplot calculates see documentation for density(). Try:

ggplot(mtcars,aes(mpg))+geom_density() + stat_density(adjust = 2)

I gather to determine the calculated optimal bandwidth - based on "the standard deviation of the smoothing kernel" - you'll need to interrogate Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. New York: Springer.


Related videos on Youtube

Author by


Founder of Practice Probs - a platform for learning programming via fun challenge problems.

Updated on June 04, 2022


  • Ben
    Ben 12 months

    How do I see what bandwidth gets used for kernels in a density plot and how do I specify a bandwidth to be used? I tried


    with no luck.

    • joran
      joran almost 10 years
      Just read ?stat_density which in turn points you to density.