Aranaud,
Two references on this issue are:
Weinberg, S.L. and V.C. Menil (1993) "The
recovery of structure in linear and ordinal data
: INDSCAL vs. ALSCAL" Multivariate Behavioral Research 28: 215-233.
MacCallum, R.C. (1977) "Effects of conditionality
on INDSCAL and ALSCAL weights" Psychometrika 42: 297-305.
Best regards,
Doug
At 02:59 AM 3/27/2007, Arnaud Trollé wrote:
Thanks for your answer Doug,
That reassures me :-).
Just one more thing, could you give me the
references of the main MonteCarlo studies you were alluding to ?
I Thank you in advance.
Best,
Arnaud Trollé.
----- Original Message -----
From: <mailto:[EMAIL PROTECTED]>J. Douglas Carroll
To: <mailto:[email protected]>[email protected]
Sent: Monday, March 26, 2007 7:39 PM
Subject: Re: Dissimilarity data obtained from 7-category scale & INDSCAL ?
Yes, no problem. INDSCAL and its variant for
the symmetric case of three-way proximity data
called SINDSCAL (written by Sandra Pruzansky,
and much more user friendly than the original
INDSCAL program written by Jih-Jie Chang) is
quite often used with ordinal scale data, with
results that are very successful-- as shown in a number of Monte Carlo studies.
Best,
Doug Carroll
At 08:16 AM 3/26/2007, Arnaud Trollé wrote:
Hello,
I've got a doubt about the following point : I
have used Indscal in order to process
dissimilarity data directly obtained from a
pairwise comparison test during which judgments
were produced on a seven-category scale
labelled from '0' to '6' (very similar to very
dissimilar). To my knowledge, one condition to
use Indscal is to have at one's disposal
dissimilarity data of metric level (interval
level or ratio level); the subjects were told
to consider the category-scale as metric (e.g.
a rating equal to '4' implies stimuli twice
more different than a rating equal to '2'), an
a posteriori check of this assumption (using
the successive interval method) was first
carried out. But as far as this assumption is
shown acceptable, is it sufficient to be able
to process this kind of data with Indscal ?
Can anyone help me to dispel this doubt ?
Many thanks.
Arnaud.
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#Marketing Dept., MEC125, 111 Washington Street, Newark, New Jersey #
#07102-3027. Tel.: (973) 353-5814, Fax: (973) 353-5376. #
# Home: 14 Forest Drive, Warren, New Jersey 07059-5802. #
# Home Phone: (908) 753-6441 or 753-1620, Home Fax: (908) 757-1086. #
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