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Re: your PSPP presentation

From: John Darrington
Subject: Re: your PSPP presentation
Date: Thu, 2 Nov 2006 19:53:03 +0800
User-agent: Mutt/1.5.9i

On Wed, Nov 01, 2006 at 09:09:03PM -0800, Ben Pfaff wrote:
     "MOHAMMED BABEKIR ELMALIK ABDALMAJID" <address@hidden> writes:
     > what i'm trying to ask is that, how many variables and cases can PSPP
     > afford? or what is the maximum number of variables and cases that i can
     > enter in PSPP? comparing with SPSS if possible.
     For most purposes, cases should be limited only by the amount of
     disk space you have available, with a hard limit of about 2
     billion cases.  Increased RAM will speed up operations, if you
     allow PSPP to use that RAM with SET WORKSPACE.
     Variables are limited by your machine's memory, again with a hard
     limit of about 2 billion variables.  Each variable should require
     less than 1 kB of RAM, although large numbers of value labels
     increase memory requirements.
     I should add these figures to the documentation.

The 2 billion (approx) limit, is just the size of 2^31 .  On a 64 bit
machine, this figure will become 2^63.  SPSS imposes artificial
limits, depending upon how much money they've been paid.  In contrast,
PSPP's capacity is limited only by the underlying hardware/operating


PGP Public key ID: 1024D/2DE827B3 
fingerprint = 8797 A26D 0854 2EAB 0285  A290 8A67 719C 2DE8 27B3
See or any PGP keyserver for public key.

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