[DDI-SRG] Analysis Unit

[Wendy Thomas]

A question doesn't have an analysis unit because it can be used in a 
number of different instruments. It gains its anlysis unit when it is used 
in a particular location in a particular instrument. That is what the 
QuestionConstruct is about. It says insert QuestionX with Universe A and 
AnlysisUnit A here. So the only way a question could be reused without 
having a new QuestionConstruct which provides the appropriate Universe and 
AnalysisUnit, would be a repeated series or loop. Example:

For each person in the house hold ask the following questions:

  Q1
  Q2
  Q3

In this case the AnalysisUnit would be the target household member.

Wendy


On Thu, 3 Jan 2008, Sanda Ionescu wrote:

> 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
>

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