[DDI-SRG] Missing value range and interval measurement

[Joachim Wackerow]

I'm not sure about SAS. It is possible to define a user-defined format 
for a value range, and this can be perhaps defined as missing.

Achim

Pascal Heus wrote:
> Achim:
> This is an issue I raised by email couple of weeks ago. It is currently 
> not supported. What I do in DExT is to assume all the values are 
> discrete and I generate a missing for every number in the range. I agree 
> that this may cause some serious overhead and I may put a limit in the 
> next version of the SPSSReader (like default of 200 values that can be 
> change by application if needed).
> The continuous variable case was also pointed out by Guido Gay a(working 
> on the R SPSS-DDI converter) and I don't think there is much we can do 
> about it for now. We should file this as a bug for 3.1. This however 
> seem to be an SPSS speicif issue, I don;t think Stata or SAS support 
> missing value ranges (?). What about other packages?
> best
> *P
> 
> 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
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>>
>>   


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