Date:         Sat, 11 Dec 2010 06:16:26 -0800
Reply-To:     Bruce Weaver <bruce.weaver@hotmail.com>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Bruce Weaver <bruce.weaver@hotmail.com>
Subject:      Re: Macro to run TTEST
In-Reply-To:  <201012101638.oBABkmaH024052@wasabi.cc.uga.edu>
Content-Type: text/plain; charset=us-ascii

While following David's advice re the manual, pay attention to the difference
between !CHAREND and !CMDEND.

Also note that your lines

!do !X !in(!XLIST)
!do !Y !in(!YLIST)

T-TEST GROUPS =!X(0 1)
  /MISSING=ANALYSIS
  /VARIABLE=!Y.

!doend
!doend

will result in one t-test for every combination of variables in the two
lists, which is not what you want.  To get what you want (A/E; B/F; C/G;
D/H), you'll need to walk through the two lists in parallel. Here's an
example of how to do that using !HEAD and !TAIL (courtesy of David a few
years ago).

!LET !XCOPY=!XLIST
**PARALLEL PROCESS VARIABLE LISTS **
!DO !Y !IN (!YLIST)
!LET !X = !HEAD(!XCOPY)
!LET l!XCOPY=!TAIL(!XCOPY)
T-TEST GROUPS=!X(0,1) /VARIABLES=!Y.
!doend

HTH.


Ray Haraf wrote:
>
> I worked around 30 t-tests by cutting and pasting the first SPSS syntax.
> However, I am curious to know an efficient way to cut and paste. I
> modified a macro posted by Bruce Weaver in October 2009 to run logistic
> regression (thanks, Bruce!). The following modified macro fails to run. No
> results, no error message.
>
> DEFINE MyTTEST (XLIST !CMDEND/YLIST !CMDEND)
>
> !do !X !in(!XLIST)
> !do !Y !in(!YLIST)
>
> T-TEST GROUPS =!X(0 1)
>   /MISSING=ANALYSIS
>   /VARIABLE=!Y.
>
> !doend
> !doend
> !ENDDEFINE.
>
> MyTTEST xlist=A B C D /ylist =E F G H.
>
> I also tried
>
> MyTTEST xlist=A(0 1) B(0 1) C(0 1) D(0 1)/ylist =E F G H. replacing !X(0
> 1) with !X
>
> Modifying lirdoall (Do All Univariate Linear Regression MACRO by Marta
> http://www.spsstools.net/Syntax/RegressionRepeatedMeasure/DoAllUnivariateLi
> nearAndLogisticRegressions.txt) gives me results in the xlist/ylist format
> for A/E F G H; B/E F G H; C/E F G H and D/E F G H. This is not what I
> want. I would like to obtain results for A/E; B/F; C/G and D/H
>
> Thanks for your care,
> Ray
>
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-----
--
Bruce Weaver
bweaver@lakeheadu.ca
http://sites.google.com/a/lakeheadu.ca/bweaver/

"When all else fails, RTFM."

NOTE: My Hotmail account is not monitored regularly.
To send me an e-mail, please use the address shown above.

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