Hi R users, Is there a way to calculate a confidence interval for each contrast in a set of orthogonal contrasts? The ?multcomp? package will calculate a CIs at the 95% family-wise confidence level. But, these confidence intervals are extremely wide. Thanks for your help. Best regards, James
Richard M. Heiberger
2016-Dec-02 04:18 UTC
[R] confidence intervals for orthogonal contrasts
James,
Please look at the maiz example, the last example in ?MMC
help("MMC", package="HH")
where I show how to construct and calculate a set of orthogonal contrasts
for a factor in an analysis of variance setting. mmc and mmcplot use glht
in the multcomp package for the underlying calculations.
If yo don't have HH, you can get it with
install.packages("HH")
See the references in ?MMC to my book and paper. The second edition
of the book is now available.
Rich
On Thu, Dec 1, 2016 at 4:17 PM, James Henson <jfhenson1 at gmail.com>
wrote:> Hi R users,
> Is there a way to calculate a confidence interval for each contrast in
> a set of orthogonal contrasts? The ?multcomp? package will calculate
> a CIs at the 95% family-wise confidence level. But, these confidence
> intervals are extremely wide.
> Thanks for your help.
> Best regards,
> James
>
> ______________________________________________
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http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
Richard, Thanks, Have not previously used the HH package, but looks as if it contains many useful tools. Will check out your book also. Best regards, James On Thu, Dec 1, 2016 at 10:18 PM, Richard M. Heiberger <rmh at temple.edu> wrote:> James, > > Please look at the maiz example, the last example in ?MMC > help("MMC", package="HH") > where I show how to construct and calculate a set of orthogonal contrasts > for a factor in an analysis of variance setting. mmc and mmcplot use glht > in the multcomp package for the underlying calculations. > > If yo don't have HH, you can get it with > install.packages("HH") > > See the references in ?MMC to my book and paper. The second edition > of the book is now available. > > Rich > > On Thu, Dec 1, 2016 at 4:17 PM, James Henson <jfhenson1 at gmail.com> wrote: >> Hi R users, >> Is there a way to calculate a confidence interval for each contrast in >> a set of orthogonal contrasts? The ?multcomp? package will calculate >> a CIs at the 95% family-wise confidence level. But, these confidence >> intervals are extremely wide. >> Thanks for your help. >> Best regards, >> James >> >> ______________________________________________ >> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see >> 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.