[DDI-SRG] FW: stats question please

[Wendy Thomas]

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