Ursula Garczarek

2017-Jul-06 18:36 UTC

### [R] Help documentation of "The Studentized range Distribution"

Dear all, I wanted to compare Bonferroni vs TukeyHSD correction over a range of groups and group sizes, and wanted to use the function qtukey. In the help documentation it says qtukey(p, nmeans, df, nranges = 1, lower.tail = TRUE, log.p = FALSE) Arguments q vector of quantiles. p vector of probabilities. nmeans sample size for range (same for each group). df degrees of freedom for s (see below). nranges number of groups whose maximum range is considered. log.p logical; if TRUE, probabilities p are given as log(p). lower.tail logical; if TRUE (default), probabilities are P[X ? x], otherwise, P[X > x]. But when I test it, "nmeans" actually should be the number of groups, and not "nrange" to fit with tables of the studentized range distribution. Can that be - it should be a rather old procedure, so I wonder whether I get something completely wrong... Regards, Ursula This email and any attachments are confidential and may ...{{dropped:8}}

Jeff Newmiller

2017-Jul-10 03:04 UTC

### [R] Help documentation of "The Studentized range Distribution"

We cannot help you understand what you are doing if you do not show us what you are doing. Here are some discussions about how to communicate questions about R [1][2][3]. [1] http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example [2] http://adv-r.had.co.nz/Reproducibility.html [3] https://cran.r-project.org/web/packages/reprex/index.html -- Sent from my phone. Please excuse my brevity. On July 6, 2017 11:36:47 AM PDT, Ursula Garczarek <Ursula.Garczarek at cytel.com> wrote:>Dear all, >I wanted to compare Bonferroni vs TukeyHSD correction over a range of >groups and group sizes, and wanted to use the function qtukey. > >In the help documentation it says > >qtukey(p, nmeans, df, nranges = 1, lower.tail = TRUE, log.p = FALSE) >Arguments >q > >vector of quantiles. > >p > >vector of probabilities. > >nmeans > >sample size for range (same for each group). > >df > >degrees of freedom for s (see below). > >nranges > >number of groups whose maximum range is considered. > >log.p > >logical; if TRUE, probabilities p are given as log(p). > >lower.tail > >logical; if TRUE (default), probabilities are P[X ? x], otherwise, P[X >> x]. > > >But when I test it, "nmeans" actually should be the number of groups, >and not "nrange" to fit with tables of the studentized range >distribution. > >Can that be - it should be a rather old procedure, so I wonder whether >I get something completely wrong... > >Regards, >Ursula > > > > > > > > > > > > > >This email and any attachments are confidential and may >...{{dropped:8}}