[DDI-SRG] Questions on inline ncube example

[Wendy Thomas]

Achim,

I won't get a chance to look at this today...maybe not for a few days. 
It's a short workweek and I'm relatively swamped...I mean more than the 
usual :)

Wendy


On Mon, 19 Nov 2007, Joachim Wackerow wrote:

> Wendy,
>
> I'm looking into how to use ncubes for the exchange of tables (structure 
> approach). I made a inline ncube example for a three-dimensional table. 
> Please look over it if everything is correct. I'm not sure with this.
>
> Making this example, some questions raised:
>
> 1. 'NCubeInstanceReference' should reference the NCube description in the 
> logical product. But a element 'NCubeInstance' exists in the ncube module. 
> This is confusing to me. Assuming the documentation is correct, then the name 
> should not express that it is a reference to a NCubeInstance but to a Ncube 
> like 'NCubeReference'.
>
> 2. Repeating the container 'MeasureValue' for each cell, also the 
> 'MeasureReference' is repeated in this case of a regular three-dimensional 
> table. Should there exist a 'DefaultMeasureReference'?
>
> 3. Ordering the MeasureValue's I assumed a hierarchy in the dimensions 
> expressed by the rank, the dimension with the first rank changing the 
> fastest, the dimension with the second rank changing the second fastest (the 
> sequence of the vlues corresponds to the cells in the display table from left 
> to right in one row, then the next row, then the next sub-table). Is this 
> correct? I didn't find anything related in the documentation.
>
> 4. Does 'GrossRecordStructure' make sense with a inline ncube (with 
> 'LogicalRecordReference' and 'PhysicalRecordSegment')? It is required here.
>
> 5. How would you describe the margin sums? It can make sense for large 
> tables.
>
> 6. I would like to describe the same table with percentages. I assume that 
> the 'RecordLayout' must be repeated with the percentage values and a 
> reference to a measure variable for percentages in logicalproduct.
>
> 7. The type of the measure is described by the label of the measure variable 
> in logicalproduct or by the related 'ConceptReference'. I think it would make 
> sense to describe it by a controlled vocabulary like for category statistics.
>
> 8. The concept of 'NCube/Attribute' is not clear to me. Can you please 
> describe it.
>
> The display tables are available at:
> values
> http://exanda.zuma-mannheim.de/Study_Wohlfahrtssurvey/Independent_SCHULAB/Dependent_ALTER1/Group_GESCHL/Weight_Weight/OutputType_Value/FileType_HTML/Trivariate.html
> row percentages
> http://exanda.zuma-mannheim.de/Study_Wohlfahrtssurvey/Independent_SCHULAB/Dependent_ALTER1/Group_GESCHL/Weight_Weight/OutputType_RowPercent/FileType_HTML/Trivariate.html
>
> Achim
>
>

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