[OpenSTA-devel] [ opensta-Bugs-1406888 ] Distribution of RANDOM variable sequences is non-uniform

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Bugs item #1406888, was opened at 2006-01-15 17:31
Message generated for change (Settings changed) made by dansut
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Category: Script Language
Group: Behavioral
Status: Open
>Resolution: Accepted
Priority: 5
Submitted By: Daniel Sutcliffe (dansut)
>Assigned to: Daniel Sutcliffe (dansut)
Summary: Distribution of RANDOM variable sequences is non-uniform

Initial Comment:
Given a RANDOM variable you would expect that for every
call to GENERATE there was an equal chance of getting
any of the potential results - this appears to not be
the case and for any set of potential results there
will be certain result values which have a higher
chance of being returned and others which have a lower
chance.

As an example given potential results of 1 and 2, there
is roughly 53% chance of getting a 2 and 47% chance of
getting a 1.  This type/scale of result weighting
applies to all result set sizes - giving a random
result that although "fairly random" could potentially
throw out test results in certain very specific
circumstances.

This problem is present on all platforms for the
OpenSTA 1.4.3 release and earlier.

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