Dear R-list members, About the parameter n of the function density() (Kernel Density Estimation, package stats): The R HTML documentation says about the parameter n: "the number of equally spaced points at which the density is to be estimated. When n > 512, it is rounded up to the next power of 2 for efficiency reasons". Note: 512 is the default size for n. The code below: data <- rnorm(500) d <- density(data,n=800) length(d$x) produces this result: [1] 800 Here, according to the R HTML documentation, d$x gives "the n coordinates of the points where the density is estimated". Of course, given that n=800, the next power of 2 would be 1024. With regard to the parameter n, does the R documentation match what function density() actually does? I am using R 2.11.0 running on Windows XP. Thank you very much. Paulo Barata ------------------------------------------------------------------ Paulo Barata Fundacao Oswaldo Cruz - Oswaldo Cruz Foundation Rua Leopoldo Bulhoes 1480 - 8A 21041-210 Rio de Janeiro - RJ Brazil E-mail: pbarata at infolink.com.br Alternative e-mail: paulo.barata at ensp.fiocruz.br