Hello all,
I am a 2 month newbie to R and am stumped. I have a data set that I've run
multivariate stats on using the manova function (I included the data set). Now
it comes time for a table of effect sizes with significance. The univariate
tests are easy. Where I run into trouble filling in the table of effect sizes
is the Mahalanobis D as an effect size. I've included the table so you can see
what group's I'm comparing. I know there's a great function for filling in ?1
and ?2 : mahalanobis(x, center, cov, inverted=FALSE, ...)
The problem is I lack the knowledge around cluster analysis of what goes into
the function for [x, center, & cov.] I have only a basic understanding of this
topic (a picture of a measured distance between two clusters on a graph).
Could someone please use my data set or a similar one (a multivariate with at
least 3 outcome variables) and actually run this function (mahalanobis). Then
please send me your output from [R] starting from the data set all the way to
the statistic. PS I know the Mahalanobis D should be ?1=3.93 & ?2=3.04.
The Y,M,O in the data set stands for young, middle, old.
I am running the latest version of R on a windows 7 machine.
Effect Sizes
Contrasts
Dependent Variables
Friends
Parents
Strangers
All
Young-Middle
-1.8768797*
-3.2842941*
-1.1094004*
?1
Middle-Old
1.34900725*
1.54919532*
-2.0107882*
?2
Gender Age Friend.Agression Parent.Agression Stranger.Agression
1 f y 8 7 8
2 f y 5 6 8
3 f y 6 3 7
4 f y 5 5 7
5 f m 15 13 10
6 f m 13 11 9
7 f m 12 12 9
8 f m 18 10 7
9 f o 11 11 10
10 f o 10 4 12
11 f o 12 9 12
12 f o 9 8 14
13 m y 13 7 7
14 m y 9 5 10
15 m y 11 4 4
16 m y 15 3 4
17 m m 14 12 8
18 m m 10 15 11
19 m m 12 11 8
20 m m 10 9 9
21 m o 10 8 11
22 m o 13 11 13
23 m o 9 8 12
24 m o 7 9 16
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