[DDI-SRG] Mixing code and value ranges

[Wendy Thomas]

Pascal...I didn't mean that you'd make a code list for the number of cats. 
Ideally, the number of cats would be listed as 1-6 numeric range with a 
missingValue attribute listing the missing value 55. What this does not 
support is when you have say 3 missing values 55, 56, 57.

55 = refused to answer
56 = don't know
57 = unable to count

We can't link the missing value labels to the missing values as listed in 
the missingValue attribute.

Wendy


On Fri, 11 Jul 2008, Pascal Heus wrote:

> Wendy:
> Thanks for the feedback. The problem is this doesn't work when you have a 
> numeric value that is a range (and not a coded list). The example of "Number 
> of cars you owned (99=don't know)" is not associate with a code/category. 
> 1,2,3,4,5,6,55 are all valid answers and I do not need to create a code list 
> (it is a numeric variable). Also, 99 is not particularly a missing value. I 
> could have other codes. What about "How much money did you earn last year (-1 
> or 9999999999 for do not want to disclose)? I know it's a bad way to code 
> this but you see this a lot in survey questions. I think we're being a bit 
> too restrictive here. We should be able to have both Code and Numeric/Text 
> representation. In this case, if it's not in the code list it is still. a 
> valid response.
> *P
>
> Wendy Thomas wrote:
>> Ok...right now you would list the valid range and list 99 in the attribute 
>> missingValue. We have on our list (from my memory..should check) a review 
>> of how we identify missing values in a consistant way for all 
>> representations. This should include the ability to reference a codescheme. 
>> By doing this we can differentiate between the valid set of non-missing 
>> data responses and missing data responses for each variable. It would also 
>> make it easier to reuse code schemes between questions and variables as the 
>> missing value codes could be declared in the variable representation rather 
>> than being affixed to each code scheme (render a new set of codes schemes 
>> that include the question codescheme plus the missing value codescheme.
>> 
>> Anyway...thats where we are. The reason for NOT making the representation 
>> repeatable is to prevent abuse. People want to put in both a codescheme 
>> representation AND a numeric representation. The comment was "how else will 
>> I know what the valid response numbers are?" the answer was if its not in 
>> the code scheme its not valid.
>> 
>> Ideally I think the representation description should list the valid data 
>> values and the valid missing values should be in missingData.
>> 
>> Wendy
>> 
>> 
>> On Thu, 10 Jul 2008, Pascal Heus wrote:
>> 
>>> Wendy and all:
>>> In DDI, how do we document a variable that mixes value ranges and
>>> code(s)? With ValueRepresentation no longer non-repeatable, this now
>>> seem tricky....
>>> For example, I can have a numeric variable like "Number of cars owned"
>>> with 99="don't know". I can I say this must be in the 0-99 range and
>>> link the value 99 to a code?
>>> I'm wondering if ValueRepresentation and CodeRepresentation should be
>>> separated or have the ability to have a CodeRepresentation and
>>> Date/Numeric/TextRepresentation at the same time.
>>> thanks
>>> *P
>>> _______________________________________________
>>> 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
>> 
>

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