Date: Wed, 25 May 2011 22:57:47 -0400
Reply-To: Rich Ulrich <rich-ulrich@live.com>
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: Rich Ulrich <rich-ulrich@live.com>
Subject: Re: using vectors and matrixes
In-Reply-To: <007701cc1ae0$b25408f0$16fc1ad0$@com>
Content-Type: multipart/alternative;
Maybe the Matrix solution can work, though I don't see how it takes into account
the test in the example on idd6bis.
I could be uninformed, but I don't know a compact way to initialize the values of Vector
in SPSS except to a single value ("0", usually), where Recode works. I think it takes
separate Computes. So here are some comments, first, on how to get around that
limitation.
For your problem, where you also want to have a program that you can read, I think
I would have a Compute which sets up a text-array with the weights, using 54F3 for
the systematic spacing. Then, I would use the internal, formatted Read (Decode?)
to create 54 variables which are read into the vector of #Weight. -- If you start the
name with "#", then the values are preserved from record to record, so you can
use a "#-name", and make the program more efficient by using DO IF $CASE=1
so that the reading only gets done once.
That is how I would import the values.
There are a couple of other weaknesses with the proposed code.
- The outer loop on #i is not needed - Instead of using the Loop/ IF combination,
you will get *exactly* the same result by using
+COMPUTE #i = idd6bis ; to set the value of #i.
- You can use the SUM( ) function as you do, but I would initialize to make *sure*
that zR01HF is zero. And that the code shows it.
What you want, after
vector prim=zR011HF to zr019HF. is
RECODE zR011HF to zr019HF(else=0); to initialize.
--
Rich Ulrich
Date: Wed, 25 May 2011 16:36:03 +0300
From: bogdanicus@GMAIL.COM
Subject: using vectors and matrixes
To: SPSSX-L@LISTSERV.UGA.EDU
Dear all, I have a repetitive task, which requires to compute several weighted means for each case in a data base.More exactly, for each case there are 9 variables (zR011HF to zr019HF), that I need to sum up weighted with different weights, depending on the values (ranging from 1 to 6) of another variable (idd6bis). The operation repeats with several other sets of variable and I expect that I will need to change several times the weights, when simulating the final model. My idea was to build a series of commands like this one: vector prim=zR011HF to zr019HF.vector weights=65 5 5 10 6 5 4 0 040 15 5 15 11 9 5 0 050 7 5 15 10 8 5 0 030 10 10 20 15 10 5 0 010 20 10 20 30 5 5 0 05 5 5 15 10 5 5 25 25.loop #i=1 to 6. loop #j=1 to 9. compute k=#j+(#i-1)*#j. if idd6bis=#i zR01HF=sum(zR01HF, weights(k)*prim(#j)). end loop.end loop.exe.del var k. The above solution does not work. I cannot use the vector command for the weights. My question is which command should I use to declare the weights as a matrix/vector, using the syntax file.
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