Specific Multiple correspondence analysis (with passive modalities)

From: Gindo Tampubolon (gindo.tampubolon@manchester.ac.uk)
Date: Wed Mar 30 2005 - 11:26:31 MEST

Dear all,

My colleague use ADDAD (www.paris.ensam.fr/ADDAD/) to
conduct specific MCA. Could anyone tell me whether ADE4 can do
specific multiple correspondence analysis (with passive modalities)?
Specific MCA deals with the fact that for most social surveys has
modalities such as `Yes', `No', and ``Don't Know'' or ``Refused to
answer''. And so, the last two modalities called passive modalities,
are not included in the construction of the duality diagram (not by
dropping those observations because those observations might give
`active modalities': `Yes' or `No' on other questions.)

I cannot read French but I quote parts from ADDAD manual (p.20)
that, I guess, relates to this:

L’analyse des correspondances multiple spécifique (ACM
spécifique) s’applique à des questionnaires où pour chaque
question l’individu interrogé ne donne qu’une modalité de
réponse et unseule, mais où il peut y avoir des réponses
manquantes, ou des modalités d’effectif très faible, ou des
modalités de non-intérêt (catégories ‘autres’), etc.

I'd be most grateful for any help you can give.

Yours sincerely,

Dr. Gindo Tampubolon
Centre for Research on Socio-cultural Change
University of Manchester

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