| Date: | Tue, 2 Dec 2003 20:42:43 +0000 |
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| Reply-To: | John Whittington <John.W@MEDISCIENCE.CO.UK> |
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| Sender: | "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU> |
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| From: | John Whittington <John.W@MEDISCIENCE.CO.UK> |
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| Subject: | Re: ***PROBLEM USING RANUNI AND FLOOR FUNCTION TO CREATEFAKE
DATA*** |
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| In-Reply-To: | <E1ARGCD-0006wG-00@coumxnn01.netbenefit.co.uk> |
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| Content-Type: | text/plain; charset="us-ascii"; format=flowed |
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At 12:27 02/12/03 -0700, Jack Hamilton wrote:
>I'm not sure where this is documented, but it doesn't appear that the
>two ranuni random number streams are independent of each other.
Jack, the pint is that the RANUNI Function (as oppsoed to the corresponding
CALL RANUNI routine), and all similar functions, only generate a SINGLE
pseudo-random number stream within a DATA step, regardless of how many
times the function occurs within the step. In contrast, each occurrence of
CALL RANUNI within a step generates a separate stream.
Historically, this difference of behaviour of the two approaches is
documented under the CALL routine, not the function, although documentation
for the latter does refer one to the CALL routine documentation 'for
further details'.
Kind Regards,
John
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