Re: pspp-dev Digest, Vol 87, Issue 7

[Mehmet Hakan Satman]

Hi John,

I have tested this command with pseudo-random real numbers drawn from a uniform distribution with parameters 0 and 1. I was comparing the group numbers of observations. I have no testing result as a file. After re-implementing the code as you described, i can prepare a testing sheet, if you want.

Data should be standardized before any cluster analysis, so that, i will re-implement the code to standardize each single column of data matrix. 

Best.

Mehmet Hakan Satman
http://www.mhsatman.com


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From: address@hidden <address@hidden>
Subject: pspp-dev Digest, Vol 87, Issue 7
To: address@hidden
Date: Sunday, March 13, 2011, 6:00 PM

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Today's Topics:

   1. Re: K-Means Clustering (John Darrington)


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Message: 1
Date: Sun, 13 Mar 2011 14:36:06 +0000
From: John Darrington <address@hidden>
Subject: Re: K-Means Clustering
To: Mehmet Hakan Satman <address@hidden>
Cc: address@hidden, John Darrington <address@hidden>
Message-ID: <address@hidden>
Content-Type: text/plain; charset="us-ascii"

Hi Mehmet,

Thanks for this.  It seems to be basically working.  There are a number of improvements
that can be made however.

1. It'll be more consistent with the rest of PSPP if you call the new file "quick-cluster.c"
   with a hyphen.

2. Instead of editing the Makefile, add the name of the new file to the manifest in
   src/language/stats/automake.mk

3. Can you remove the line UNIMPL_CMD ("QUICK CLUSTER", "Fast clustering")
   from command.def instead of commenting it out.



Now the "quick cluster" command can parse these options in the pspp command line:
     
     quick cluster /VARIABLES=x y z /GROUPS=5 /MAXITER=100.

This is different to the syntax in the SPSS documentation which expects:

   QUICK CLUSTER x y z
      /CRITERIA = CLUSTER(5) MXITER (100).

where the /CRITERIA subcommand and each part thereof is optional.  You can see an example of how to
implement a /CRITERIA subcommand in src/language/stats/factor.c - in fact, you
may be able to copy much of that parser's code.

Avoid using atoi in the parser.  Instead of    groups=atoi(lex_tokcstr(lexer));
write :
    lex_force_int (lexer);
    groups = lex_integer (lexer);
     

  i think a small development pdf documentation does not satisfies the needs of implementing
  something in PSPP.

You're  right.  The developer documentation is woefully incomplete.

You mentioned earlier that you had tested the results against spss. Do you have the results
from these tests, and the test data that you used?  I would be interested to see this.
     

Best regards,

John

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