Re: Phone Number as Random

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Re: Phone Number as Random

Mario Giesel-2
There are random number tables and random number generators on the internet.
Maybe you have a look?

Mario Giesel
Munich, Germany


Am Montag, 14. Januar 2019, 19:49:53 MEZ hat Peter Spangler <[hidden email]> Folgendes geschrieben:


Hi Stats Colleagues!

I’m running an experiment and hoping that someone with Census or other government experience might be helpful on. I am trying to select a random identifier to select treatment candidates in a call center experiment. I am considering using the last digit of phone number as that identifier. Is this random? Other comments?

Peter Spangler


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Re: Phone Number as Random

Ki Park
The short answer is "no." Yet, it will really depend on how those phone
numbers have been generated or acquired from an existing list. If the number
is from a list, it is not random. Also, some 'random' phone numbers are
generated within an 'area' (e.g. 614-319-XXXX), so even though the number
could be random, this is not representative of the population that you are
interested in because the area and population do not match.
I would say that the call center should know how those numbers have been
generated/acquired. You may also have a problem that the last 4 digits could
be in more than one case.

Ki



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Re: Phone Number as Random

Art Kendall
In reply to this post by Mario Giesel-2
try something like this untested syntax. Just create a new pseudo-random
number in SPSS
set seed=20190115.
compute ranorder = uniform(1).
sort cases by ranorder.
compute newgroup= mod($casenum,2)+1.

or
compute ranorder = uniform(1).
rank variables = ranorder /ntiles = 2 into newgroup



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Art Kendall
Social Research Consultants
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