Date: Fri, 15 Jul 2011 13:58:27 -0700
Reply-To: David Marso <david.marso@gmail.com>
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: David Marso <david.marso@gmail.com>
Subject: Re: Syntax for SAMPLE
In-Reply-To: <1310759196740-4591976.post@n5.nabble.com>
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GACK Bruce!
That old thing???
It is from 1996 right about the time I bailed from SPSS TekSport and
transferred to the consulting group.
Almost 15 years to the day... How time flies!!!!!!!!!!!!!!!!
The SPSS-X Archives are truncated at 1996 and everything before that has
been bit-bucketted.
Hey, ever wonder what ever happened to all the gems which I posted between
1992 and 1996?
There were some pretty twisted Rube-Goldbergesque monstrosities I inflicted
upon the world in those days. Self modifying SPSS code, unintelligible one
liners, programs to read data configured like they came from the brain of
H.P. Lovecraft or some other dark place (almost lost my mind doing that
job).
I used to have those all on my old dead PC (HD is fine but the box is dead,
need to pull data some day).
*BUT* I think I like what I posted earlier today much more than that old
one.
Note also that what you reference does BOOTSTRAP sampling (with
replacement).
The current does sampling without replacement (slightly oversample beyond
the desired ratio, XSAVE cases which are 'sampled', then do the random
scramble and nuke the extra cases at the end).
Thanks for the blast from the past (I think-- cringe--)
Bruce Weaver wrote:
>
> Hi John. I've sent you something off-list that you may be able to cobble
> into the kind of demo/tutorial you want. It uses some code written by
> David Marso, but posted by his then colleague David Nichols. Here's the
> link:
>
>
> http://groups.google.com/group/sci.stat.consult/msg/710ea4ab83ddf24a?dmode=source
>
> HTH.
>
>
>
> John F Hall wrote:
>>
>> David
>>
>> It was just a thought, and I was only trying to help!
>>
>> I once had a similar problem when trying to introduce students to
>> inferential statistics. I'd have say 24 students and a survey with 1800
>> cases for a lab session. Each student was asked to sample n from N with
>> a
>> different SET SEED starting point. This was in the days of 16 VDU's
>> connected to a remote Vax mainframe (12 working if you were lucky and
>> severe
>> time constraints if we didn't want to get locked in the building, or get
>> away before the Arsenal match finished up the road) not modern PCs and
>> distance learning. The idea was to get 3 samples each to yield 72
>> statistics (mean lifesat, % happy or whatever) which we then plotted (on
>> the
>> chalk-board) hopefully to demonstrate a distribution with an
>> approximately
>> normal distribution. Sometimes it worked, sometimes it didn't (usually
>> because sampling 30 from 3000 isn't as stable as 300 from 3000) but the
>> students learned a lot from the attempt and understood what we were
>> trying
>> to do, especially that the sampling distribution of the mean was
>> approximately normal even if the variable itself was not (eg age)
>>
>> Now, how about some syntax to do what I need for a new tutorial for the
>> website?
>>
>> Assume data set is BSA89.sav, N is 3000 and I want 100 samples of size
>> 300:
>> then to save mean lifesat, mean age and % very happy (code 3 on happy) as
>> variables in a separate file with 100 cases (one for each sample).
>>
>> Have a nice weekend.
>>
>> John
>>
>> johnfhall@orange.fr
>> www.surveyresearch.weebly.com
>>
>>
>>
>>
>>
>>
>>
>>
>> -----Original Message-----
>> From: SPSSX(r) Discussion [mailto:SPSSX-L@LISTSERV.UGA.EDU] On Behalf Of
>> David Marso
>> Sent: 15 July 2011 19:33
>> To: SPSSX-L@LISTSERV.UGA.EDU
>> Subject: Re: Syntax for SAMPLE
>>
>> It makes *NO* sense at all to use SAMPLE within a DO REPEAT.
>> Think about that for a moment ;-)
>>
>> When you do something like
>> DO REPEAT X= a b c d / Y = e f g h / Z= ae be cg dh.
>> COMPUTE Z=X/Y.
>> END REPEAT.
>>
>> what do you end up with?
>> 4 new variables on *EACH* case...
>> i.e. DO REPEAT handles TRANSFORMATIONS and applies to each case.
>> How would SAMPLE fit into a DO REPEAT?
>>
>> --
>> View this message in context:
>> http://spssx-discussion.1045642.n5.nabble.com/Syntax-for-SAMPLE-tp4591268p45
>> 91568.html
>> Sent from the SPSSX Discussion mailing list archive at Nabble.com.
>>
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>
--
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