[R] aov + pairwise.t.test: only selected pairs

[ONKELINX, Thierry]

Have a look at the multcomp package. The examples in glht() demonstrate how to specify the required contrasts.

Best regards,

ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature and Forest
team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
Kliniekstraat 25
1070 Anderlecht
Belgium
+ 32 2 525 02 51
+ 32 54 43 61 85
Thierry.Onkelinx op inbo.be
www.inbo.be

To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data.
~ John Tukey


-----Oorspronkelijk bericht-----
Van: r-help-bounces op r-project.org [mailto:r-help-bounces op r-project.org] Namens Andreas Maunz
Verzonden: woensdag 11 juni 2014 10:02
Aan: r-help op r-project.org
Onderwerp: [R] aov + pairwise.t.test: only selected pairs

Hi,

I have a 1-way anova result and want to do a post test.

I want to do pairwise t-tests where the global variance is taken into account (i.e. a real post test on the anova result, not multiple simple t tests on the samples).

I understand I should use pairwise.t.test() for that. However, it does not allow me to select specific pairs, it always analyzes all pairs. How can I analyze specific pairs only?

Thanks
Andreas

        [[alternative HTML version deleted]]

______________________________________________
R-help op r-project.org 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.
* * * * * * * * * * * * * D I S C L A I M E R * * * * * * * * * * * * *
Dit bericht en eventuele bijlagen geven enkel de visie van de schrijver weer en binden het INBO onder geen enkel beding, zolang dit bericht niet bevestigd is door een geldig ondertekend document.
The views expressed in this message and any annex are purely those of the writer and may not be regarded as stating an official position of INBO, as long as the message is not confirmed by a duly signed document.