Date: Wed, 16 Feb 2005 02:37:00 +0100
Reply-To: "Kooij, A.J. van der" <KOOIJ@fsw.leidenuniv.nl>
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: "Kooij, A.J. van der" <KOOIJ@fsw.leidenuniv.nl>
Subject: Re: Correspondence Analysis (Optimal Scaling/Homogenity Analysis)
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Homogenity Analysis (Multiple Correspondence in SPSS 13.0; Homals in earlier versions) is (multiple) correspondence analysis. You can check this by using indicator matrix as input to Correspondence: The 2 analyses below give equal results (object scores Multiple Correspondence/Homals = row points Correspondence; quantifications Multiple Correspondence/Homals = columns points Correspondence) So, no need to recode variables.
The normalization subcommand is not available with Homals (Homals normalization is v(ariable) principal=c(olumn) principal), also no biplot with Homals (only separate plots of the object scores and the quantifications).
data list free/v1 v2 v3.
begin data.
1 2 1
2 2 1
2 3 1
2 2 2
3 2 2
3 2 2
3 1 2
end data.
Multiple Correspondence /var v1 v2 v3
/analysis v1 v2 v3
/normalization vprincipal
/print obj quant
/plot biplot.
data list free/g11 g12 g13 g21 g22 g23 g31 g32.
begin data.
1 0 0 0 1 0 1 0
0 1 0 0 1 0 1 0
0 1 0 0 0 1 1 0
0 1 0 0 1 0 0 1
0 0 1 0 1 0 0 1
0 0 1 0 1 0 0 1
0 0 1 1 0 0 0 1
end data.
Correspondence
/table=all(7,8)
/print rpoints cpoints
/normalization cprincipal
/plot biplot.
VECTOR g1(3F8.0).
LOOP #i = 1 TO 3.
COMPUTE g1(#i)= v1 = (#i).
END LOOP.
VECTOR g2(3F8.0).
LOOP #i = 1 TO 3.
COMPUTE g2(#i)= v2 = (#i).
END LOOP.
VECTOR g3(2F8.0).
LOOP #i = 1 TO 2.
COMPUTE g3(#i)= v3 = (#i).
END LOOP.
EXECUTE.
Regards,
Anita van der Kooij
________________________________
From: SPSSX(r) Discussion on behalf of Claus D. Hansen
Sent: Tue 15/02/2005 22:45
To: SPSSX-L@LISTSERV.UGA.EDU
Subject: Correspondence Analysis (Optimal Scaling/Homogenity Analysis)
Dear members of this list,
I was wondering if anyone could point me to an article, a book or some kind
of website which had examples on how to perform correspondence analysis
using the procedures Optimal Scaling and Homogenity Analysis in SPPS. What I
am most interested in is how to recode variables so they could be used in
this type of analysis.
Thank you in advance,
Claus D. Hansen
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