RE: [R] Dendrogram for a type unbalanced ANOVA

From: Ben Fairbank <BEN_at_ssanet.com>
Date: Wed 06 Apr 2005 - 03:00:51 EST


It is seldom a good idea to use the _significance_ of a difference as a surrogate for its magnitude. The reason is that the significance varies with many irrelevant aspects of the analysis, such as the model and the sample size. If you have other measures of group similarity, then there are many hierarchical clustering methods that might meet your needs. Try ?hclust to get started.

Ben Fairbank

-----Original Message-----
From: r-help-bounces@stat.math.ethz.ch
[mailto:r-help-bounces@stat.math.ethz.ch] On Behalf Of bob sandefur Sent: Tuesday, April 05, 2005 11:39 AM
To: r-help@stat.math.ethz.ch
Subject: [R] Dendrogram for a type unbalanced ANOVA

Hi-

I have about 20 groups for which I know the mean, variance, and number of
points per group. Is here an R function where I can plot (3 group example)
something like

|                  |----- 2
|      |-----------|
|      |           |----- 1
|      |
|------|
|      |----------------- 3

|
|
0 25 50 75 100

ie 1 and 2 are different at 75% level of confidence

   1 2 combined are different from 3 at 25% level of confidence

If this plot is a silly idea can someone point me to a reference for anything similar?

Thanx

Robert (Bob) L. Sandefur PE
Senior Geostatistician / Reserve Analyst CAM
200 Union Suite G-13

Lakewood, Co
80228  

rsandefur@cam-llc.com  

303 472-3240 (cell) <-best choice  

303 716-1617 ext 14



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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 Received on Wed Apr 06 03:07:31 2005

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