Multidimensional Scaling Question

[Brandon Paris]

Hi -

I have a question regarding the use of multidimensional scaling.  I have
conducted an MDS in SPSS using a distance matrix from an existing set of
data (15 items).  I now have a new set of data that contains the
original distance matrix + 3 more items (so an 18-item distance matrix).
I want to get the positions of the 3 new items in the context of the
original 15 that was done.   I know how to do this using other graphing
methods such as Correspondence Analysis (in CA, I would reference the 3
items as supplemental); is there a way to do this using MDS?  Thanks.

Brandon L. Paris
Manager, Analytic Innovation & Methods
Center for Learning & Experimentation/Consumer Insights
General Mills, Inc.

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[James Whanger]

Brandon,

The variable "zq721a1m4" is used twice.  It appears the second time it
was intended to be changed to "zq721a2m4".

Good luck with your analyses,

Jim

On Nov 2, 2007 11:00 AM, Brandon Paris <[hidden email]> wrote:

> Hi -
>
> I have a question regarding the use of multidimensional scaling.  I have
> conducted an MDS in SPSS using a distance matrix from an existing set of
> data (15 items).  I now have a new set of data that contains the
> original distance matrix + 3 more items (so an 18-item distance matrix).
> I want to get the positions of the 3 new items in the context of the
> original 15 that was done.   I know how to do this using other graphing
> methods such as Correspondence Analysis (in CA, I would reference the 3
> items as supplemental); is there a way to do this using MDS?  Thanks.
>
> Brandon L. Paris
> Manager, Analytic Innovation & Methods
> Center for Learning & Experimentation/Consumer Insights
> General Mills, Inc.
>
> To manage your subscription to SPSSX-L, send a message to
> [hidden email] (not to SPSSX-L), with no body text except the
> command. To leave the list, send the command
> SIGNOFF SPSSX-L
> For a list of commands to manage subscriptions, send the command
> INFO REFCARD
>

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[Kooij, A.J. van der]

Good morning list.
 
Suppose you already have the solution to the 15 items.
And now you want to add three more.
In PROXSCAL you can use the fixed coordinates restriction to fix the coordinates of the 15 items,
and then estimate the remaining three.
 
Good luck, Frank.
Develloper and programmer of PROXSCAL.
 


---------------------------------------------
Frank M.T.A. Busing
Psychometrics and Research Methodology
Leiden University
P.O.Box 9555, 2300 RB Leiden, The Netherlands
---------------------------------------------

 

________________________________

From: SPSSX(r) Discussion on behalf of Brandon Paris
Sent: Fri 02/11/2007 16:00
To: [hidden email]
Subject: Multidimensional Scaling Question



Hi -

I have a question regarding the use of multidimensional scaling.  I have
conducted an MDS in SPSS using a distance matrix from an existing set of
data (15 items).  I now have a new set of data that contains the
original distance matrix + 3 more items (so an 18-item distance matrix).
I want to get the positions of the 3 new items in the context of the
original 15 that was done.   I know how to do this using other graphing
methods such as Correspondence Analysis (in CA, I would reference the 3
items as supplemental); is there a way to do this using MDS?  Thanks.

Brandon L. Paris
Manager, Analytic Innovation & Methods
Center for Learning & Experimentation/Consumer Insights
General Mills, Inc.

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[hidden email] (not to SPSSX-L), with no body text except the
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====================To manage your subscription to SPSSX-L, send a message to
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