Message-ID: <p06210220be7b02316a37@[165.124.163.94]>
Date: 2005-04-07T15:30:51Z
From: William Revelle
Subject: Dta structure of LOADINGS class in factanal
In-Reply-To: <4255393D.7030103@gmail.com>
At 9:44 AM -0400 4/7/05, Tamas Gal wrote:
>Hi R users,
>I need some help in the followings:
>I'm doing factor analysis and I need to extract the loading values and
>the Proportion Var and Cumulative Var values one by one.
>Here is what I am doing:
>
>>fact <- factanal(na.omit(gnome_freq_r2),factors=5);
>>fact$loadings
>
>
>Loadings:
> Factor1 Factor2 Factor3 Factor4 Factor5
>b1freqr2 0.246 0.486 0.145
>...
>b9freqr2 0.148 0.449 0.103 0.327
>
> Factor1 Factor2 Factor3 Factor4 Factor5
>SS loadings 1.294 1.268 1.008 0.927 0.730
>Proportion Var 0.144 0.141 0.112 0.103 0.081
>Cumulative Var 0.144 0.285 0.397 0.500 0.581
>
>
>I can get the loadings using:
>
>>fact$loadings[1,1]
>
>[1] 0.2459635
>
>but I couldn't find the way to do the same with the Proportion Var and
>Cumulative Var values.
Although not pretty, try
colSums(fact$loading*fact$loading)/dim(fact$loading)[1] for the
proportion Var and
cumsum(colSums(fact$loading*fact$loading)/dim(fact$loading)[1]) to
get the cumulative Var values
Bill
--
William Revelle http://pmc.psych.northwestern.edu/revelle.html
Professor http://personality-project.org/personality.html
Department of Psychology http://www.wcas.northwestern.edu/psych/
Northwestern University http://www.northwestern.edu/