[DDI-SRG] Missing value range and interval measurement

[Wendy Thomas]

I believe we discussed this but didn't solve it. We need to look at the 
missing value structure in Representation to allow for more than just 
listing of values.

wlt


On Thu, 15 May 2008, Joachim Wackerow wrote:

> Currently I'm working again on the SPSS converter.
>
> I'm wondering how to express in DDI a missing value range of a variable
> with an interval measurement level.
>
> For example the variable temperature. A missing value range is 20-25
> Celsius. The values are expressed as floating numbers like 20.17 etc.,
> which are not all known in advance. This can be expressed in SPSS. In
> DDI I don't see a way. Do I miss something?
>
> For variables with ordinal measurement (i.e. with categories like
> occupation) a workaround can be used for expressing a missing value
> range in DDI. Each category in the missing value range must be defined
> as missing. This can produce some overhead. Category entries with just
> the missing definition can be produced without labels depending on the
> definition in files of the statistical packages.
>
> Any ideas? I think we discussed already a similar issue?
>
> Achim
> _______________________________________________
> DDI-SRG mailing list
> DDI-SRG at icpsr.umich.edu
> http://www.icpsr.umich.edu/mailman/listinfo/ddi-srg
>

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