On 20 Oct 2003 at 7:35, Haynes, Maurice (NIH/NICHD) wrote: > Is it not true that the Shapiro Wilks test implemented in the package > ctest requires the assumption that the population variance of the > variable is known?
AFAIK, there is not. And there is no such argument to shapiro.test, so if this was a requirement for the correctness of shapiro.test, the implementation in ctest is wrong, which I doubt. Furthermore, from my limited reading about the Shapiro-Wilk test there is no reason to beleave this is a requirement. > > Is it also not true that the Lilliefors is not a test of normality > as such, but is rather a correction of the p-value for the > Kolmogorov Smirnov test? Well, yes, but it is still a (bad) test of normality, isnt it? Kjetil Halvorsen > > Thanks, > > Maurice Haynes > National Institute of Child Health and Human Development > Child and Family Research Section > 6705 Rockledge Drive > Bethesda, MD 20892 > Voice: 301-496-8180 > Fax: 301-496-2766 > E-Mail: [EMAIL PROTECTED] > > > > | -----Original Message----- > | From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > | Sent: Friday, October 17, 2003 3:33 PM > | To: R HELP; Martina Pavlicova > | Subject: Re: [R] Lilliefors Test > | > | > | On 17 Oct 2003 at 13:59, Martina Pavlicova wrote: > | > | There is shapiro.test in package ctest, which have much better power > | properties than Lillefors test. So there is no need to have > | Lilliefors test in R, except for archeological interest. > | > | Kjetil Halvorsen > | > | > > | > Hello everybody, > | > > | > I would like to perform a test for normality (without specifying the > | > mean a variance) on the sample data (80 observations). I found that > | > Lilliefors test is appropriate. Does anybody have it > | programmed already, > | > or is there a function for this test in R? > | > > | > Thank you very much, > | > > | > Martina Pavlicova > | > > | -------------------------------------------------------------- > | ------------ > | > Department of Statistics Office Phone: (614) 292-1567 > | > 1958 Neil Avenue, 304E Cockins Hall FAX: (614) 292-2096 > | > The Ohio State University E-mail: > | [EMAIL PROTECTED] > | > Columbus, OH 43210-1247 > | www.stat.ohio-state.edu/~pavlicov > | > > | > ______________________________________________ > | > [EMAIL PROTECTED] mailing list > | > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > | > | ______________________________________________ > | [EMAIL PROTECTED] mailing list > | https://www.stat.math.ethz.ch/mailman/listinfo/r-help > | ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
