Date:         Thu, 17 Mar 2011 05:05:07 -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: Calculating a mean within a vector
In-Reply-To:  <1300356548618-3868612.post@n5.nabble.com>
Content-Type: text/plain; charset=us-ascii

Add an inner loop and manually calculate your means.
Vector Gesprekstevredenheid = Gesprekstevredenheid.1 to
Gesprekstevredenheid.116 .
Vector Meting(5).
***NOT  Vector= Meting1 to Meting5 (unless these already exist).

LOOP b=1 to 5.
+  compute Interval_AFG=whatever......
+  COMPUTE mysum=0.
+  compute myN=0.
+  LOOP c=(Interval_AFG*b)-(Interval_AFG-1) TO Interval_AFG*b.
+        compute mysum=mysum+Gesprekstevredenheid(c).
+        compute myN=myN+1.
+  END LOOP.
+  COMPUTE meting(b) =mysum/myn.
END LOOP.


TimBakers wrote:
>
> Dear all,
>
> I'm fairly new to spss so please forgive me if i'm over or
> undercomplicating this problem..
>
> I am trying to calculate 5 means per testsubject in my spss datafile (i
> have over 550 subjects).
> These means represent time periods from start to finish and my goal is to
> do a repeated measure on this data.
> It is the case that not all test subjects have recieved the same amount of
> scores over the entire period, some have over a 100, while others have
> less than 20 for example.
> I still want to obtain 5 mean scores per subject, so this means for a
> person with a 100 scores i will have to average 20 scores per period,
> while a subject with 20 scores only needs 4 scores per period.
>
> my thought was to create a vector of all the scores (scores 1 to 116 with
> 116 being the maximum amount of scores 1 person has obtained. This vector
> is called "Gesprekstevredenheid"
>
> I have also created an interval index which comes down to the total amount
> of scores recieved, devided by 5, to indicate how many scores per period
> need to be averaged per person. this variable is called Interval_AFG.
>
> my syntax so far...
>
> Vector Gesprekstevredenheid = Gesprekstevredenheid.1 to
> Gesprekstevredenheid.116 .
> Vector Meting = Meting1 to Meting5 .
>
> loop b = 1 to 5.
> compute meting(b) = mean
> (Gesprekstevredenheid((Interval_AFG*b)-(Interval_AFG-1)) TO
> Gesprekstevredenheid(Interval_AFG*b)) .
> end loop .
> EXECUTE .
>
> Meting 1 to 5 are the variables i want to put the averages per period. The
> math part seems to work ((Interval_AFG*b)-(Interval_AFG-1)),
> (Interval_AFG*b)), but I keep getting error messages about the TO oparator
> between the two vectorindexes. I have come to the conclusion that a TO
> oparator does not work when working with a vector (because if I use normal
> variables instead the code works), but I have totally no clue how to do it
> otherwise..
>
> If someone has an idea what to typ instead of the TO operator, or an
> entirely new way of doing what I am intending to do, you help would be
> very very welcome...
>
> Best regards, Tim
>


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