[DDI-SRG] FW: stats question please
Joachim Wackerow
joachim.wackerow at gesis.org
Wed Mar 25 14:37:36 EDT 2009
I agree completely, this approach should be the right one.
Achim
Wendy Thomas wrote:
> Different sets of statistics are easy as you can simply provide multiple
> summary statistics for the same variable. The question is when you use
> multiple weights to create a statistics. I recommended the use of a
> variable that reflects the generated weight using a generation instruction
> to describe the process. Then that weight can be referred to from the
> summary statistics. Did you have another approach??
>
> wendy
>
>
> On Tue, 24 Mar 2009, arofan.gregory wrote:
>
>> Wendy:
>>
>> We're here in Ottowa working with the Canadian RDC people (Stats Can data)
>> and they have exactly the same issue - they need to have different weights
>> for a single study, and therefore different sets of statistics.
>>
>> This is *very* common in Stats Canada data, apparently.
>>
>> I'm happy to show you how I think it could be fixed.
>>
>> Cheers,
>>
>> Arofan
>>
>> -----Original Message-----
>> From: ddi-srg-bounces at icpsr.umich.edu
>> [mailto:ddi-srg-bounces at icpsr.umich.edu] On Behalf Of Wendy Thomas
>> Sent: Monday, March 23, 2009 11:26 AM
>> To: Sanda Ionescu
>> Cc: Mary Vardigan; TIC list
>> Subject: Re: [DDI-SRG] FW: stats question please
>>
>> We require the ability to make this machine actionable. We are creating
>> variable representations of measures, concatonated measures providing
>> unique identifiers and links. We are no longer just documenting data.
>>
>> Wendy
>>
>>
>> On Mon, 23 Mar 2009, Sanda Ionescu wrote:
>>
>>> Wendy,
>>>
>>> It is for case 2) - a combination of weights.
>>> But ... I don't know...
>>> Creating a "fake" weight in DDI only (not in the data) seems a little
>> far-fetched.
>>> And really, I'm not sure we should be going that way.
>>> Aren't we just documenting data?
>>> Why resort to creating artifices like that - assigning fake values,
>> creating imaginary weights?
>>> And again, I think this makes it so much more difficult to automate - both
>> direct markup, and conversions.
>>> Sanda.
>>>
>>> Sanda Ionescu
>>> ICPSR
>>> University of Michigan
>>> P.O. Box 1248
>>> Ann Arbor, MI 48106
>>>
>>> Phone, Fax: 734-615-7890
>>>
>>> -----Original Message-----
>>> From: Wendy Thomas [mailto:wlt at pop.umn.edu]
>>> Sent: Monday, March 23, 2009 12:48 PM
>>> To: Sanda Ionescu
>>> Subject: Re: FW: stats question please
>>>
>>> Please clarify
>>>
>>> If they mean that a variable can have more than one weight, a separate
>>> statistic is created for each weight used.
>>>
>>> If they mean they use a combination of weights, then DDI 3.0 requires they
>>> create a variable (not expressed in the data set physical content) that
>>> provides the expression of that multiple weighting through its generation
>>> instruction.
>>>
>>> For example: If I had a standard weight A and also applied weight variable
>>> X and weight variable Y in calculating the statistic then I would need to
>>> create a variable Z which using the generation instruction of
>>> "StandardWeightA * variableX * variableY.
>>>
>>> It may not be how they want to express it, but this is the way its done.
>>>
>>> Wendy
>>>
>>>
>>> On Mon, 23 Mar 2009, Sanda Ionescu wrote:
>>>
>>>> Hi, Wendy.
>>>> This is a different issue.
>>>> Our researchers/ analysis specialists seem to think that it is necessary
>> to be able to reference multiple weights for a statistic.
>>>> Please see exchange below.
>>>> Could you submit this as a request for a change to TIC?
>>>> Thanks
>>>> Sanda.
>>>>
>>>> Sanda Ionescu
>>>> ICPSR
>>>> University of Michigan
>>>> P.O. Box 1248
>>>> Ann Arbor, MI 48106
>>>>
>>>> Phone, Fax: 734-615-7890
>>>>
>>>> -----Original Message-----
>>>> From: Felicia LeClere
>>>> Sent: Monday, March 23, 2009 10:14 AM
>>>> To: Sanda Ionescu
>>>> Subject: Re: stats question please
>>>>
>>>> It happens...so it is necessary to be able to have more than one weight
>>>>
>>>> -----Original Message-----
>>>> From: Sanda Ionescu
>>>> To: Lynette Hoelter; Felicia LeClere
>>>> CC: Mary Vardigan
>>>> Sent: Mon Mar 23 09:23:52 2009
>>>> Subject: RE: stats question please
>>>>
>>>> It's about DDI.
>>>>
>>>> Version 3 only allows 1 weight to be defined per statistical value.
>>>>
>>>> And we need to know if it is necessary to ask for the weight to become
>> repeatable (so that one can link to more than one).
>>>> This is not about whether it's LIKELY or not (because, yes, it is
>> UNLIKELY) but rather is it necessary to cover for that possibility too,
>> however unlikely it may be?
>>>> Sanda.
>>>>
>>>>
>>>>
>>>> Sanda Ionescu
>>>> ICPSR
>>>> University of Michigan
>>>> P.O. Box 1248
>>>> Ann Arbor, MI 48106
>>>>
>>>> Phone, Fax: 734-615-7890
>>>>
>>>> From: Lynette Hoelter
>>>> Sent: Friday, March 20, 2009 4:22 PM
>>>> To: Sanda Ionescu; Felicia LeClere
>>>> Cc: Mary Vardigan
>>>> Subject: RE: stats question please
>>>>
>>>>
>>>>
>>>> In theory, I don't see why not because the weights just multiple the
>> values for the cases by some fraction, so you could multiply by two.
>>>> Why?
>>>>
>>>>
>>>>
>>>> ....................................................
>>>> Lynette F. Hoelter, Ph.D.
>>>> Dir., Instructional Resources & Development, ICPSR
>>>> Institute for Social Research
>>>> University of Michigan
>>>>
>>>>
>>>>
>>>> From: Sanda Ionescu
>>>> Sent: Friday, March 20, 2009 3:13 PM
>>>> To: Felicia LeClere; Lynette Hoelter
>>>> Cc: Mary Vardigan
>>>> Subject: stats question please
>>>>
>>>>
>>>>
>>>> Felicia, Lynette,
>>>>
>>>> In Variable Statistics is it POSSIBLE to obtain ONE value (say, mean, or
>> mode, etc.) by applying TWO different weights - not sequentially, but at the
>> same time?
>>>> Thanks
>>>>
>>>> Sanda.
>>>>
>>>>
>>>>
>>>> Sanda Ionescu
>>>> ICPSR
>>>> University of Michigan
>>>> P.O. Box 1248
>>>> Ann Arbor, MI 48106
>>>>
>>>> Phone, Fax: 734-615-7890
>>>>
>>>>
>>> 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
>>
>
> 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
> _______________________________________________
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> DDI-SRG at icpsr.umich.edu
> http://www.icpsr.umich.edu/mailman/listinfo/ddi-srg
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