Re: your PSPP presentation

[John Darrington]

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
system.

J'

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