General questions elicit general answers; more specific questions elicit more specific answers. For example,
> exp(2+9/2) [1] 665.1416 url: www.econ.uiuc.edu/~roger Roger Koenker email [EMAIL PROTECTED] Department of Economics vox: 217-333-4558 University of Illinois fax: 217-244-6678 Champaign, IL 61820 On Aug 27, 2006, at 11:52 AM, Paul Smith wrote: > On 8/26/06, Mike Nielsen <[EMAIL PROTECTED]> wrote: >> Yes. >> >>> Can R compute the expected value of a random variable? > > Mike: thank you very much indeed for your so insightful and complete > answer. I have meanwhile deepened my research and, as a consequence, > I have found the following solution, which seems to work fine: > >> integrand <- function(x){x*dlnorm(x,meanlog=2,sdlog=3)} >> integrate(integrand,-Inf, Inf) > 665.146 with absolute error < 0.046 >> > > There is also a package apt to calculate expected values: it is called > distrEx. (Thanks, Matthias.) > > Paul > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting- > guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.