[DDI-SRG] Questions on inline ncube example

[Joachim Wackerow]

Some additional questions on this:

How is it possible to describe a sparse matrix in an inline ncube 
without including all the empty cells?

Can a weighted table described as such? Or did I miss something?

Re 5: The margin sums can be described for a three-dimensional table by 
three additional two-dimensional ncubes. Is there an easier way?

Achim

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
> 
> 
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