[DDI-SRG] Analysis Unit

[Sanda Ionescu]

Wendy,

I think Analysis Unit should be repeatable in Study Unit, and
non-repeatable in Variable and Ncube.

A question CAN have more than one analysis unit in a study - for
instance the same question (say, income) may be asked about  the head of
household and the household as a whole.
But beyond that, I still have a fuzzy understanding of the
question-control construct piece(s) and how they are supposed to work. 
In the question scheme, to my mind, a question should appear just once
even if it was asked multiple times (is it not our goal to reuse rather
than repeat?).  ..But then, as I look at QuestionItem, it does not have
an entry for AnalysisUnit (correct?), so then that's not an issue.

Not sure how Analysis Unit is treated in Instrument. If we use
QuestionConstruct to define flow, then Analysis Unit should be unique
here too.

Sanda.


Sanda Ionescu
ICPSR
University of Michigan
P.O. Box 1248
Ann Arbor, MI 48106

Phone, Fax: 734-615-7890 
-----Original Message-----
From: Wendy Thomas [mailto:wlt at pop.umn.edu] 
Sent: Thursday, January 03, 2008 12:46 PM
To: ddi-srg at icpsr.umich.edu
Cc: Sanda Ionescu; Mary Vardigan
Subject: Analysis Unit

Please read bug 103 regarding AnalysisUnit. My question is, does a
question used in a specific location of an instrument ever have more
than one analysis unit? Does a specific Variable or a specific NCube
ever have more than one analysis unit?

If you answer yes to any of these, please provide a use case.

Wendy

Wendy L. Thomas                          Phone: +1 612.624.4389
Data Access Core Director		 Fax:   +1 612.626.8375
Minnesota Population Center              Email: wlt at pop.umn.edu
University of Minnesota
50 Willey Hall
225 19th Avenue South
Minneapolis, MN 55455