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Subject: Re: DTS article robert hyatt - revealing his bad math

Author: Uri Blass

Date: 10:51:52 09/03/02

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On September 03, 2002 at 13:45:09, Vincent Diepeveen wrote:

>On September 03, 2002 at 13:31:15, Uri Blass wrote:
>
>there is 24 positions x 1,2,4,8,16 processors.
>so there is pretty much data. You can see it in
>first icca from 1997 where bob describes DTS.
>
>If i claim an average speedup of 1.90 then there is
>a domain of about 1.85 - 1.949 where the speedups
>fall in. However bob's speedups all fall in only
>1/10 of it. So for every rounded number there is a
>1/10 chance.
>
>A few numbers where they have .01 that's a round off
>error usually. He modified his data a little but not
>enough to get outside the error margin of statistical
>analysis on data.
>
>In short for every round number there is about a 1/10 chance
>to happen.
>
>1/10^(24*3.5) is about 1 / 10^30

I did not read the article but
I saw in your post only one round number with a lot of 0's
(13).

I understood from your post that 13 is only relevant to
position number 10

Here is the data again:

pos   2      4      8   16
1  2.0000 3.40   6.50   9.09
2  2.00   3.60   6.50  10.39
3  2.0000 3.70   7.01  13.69
4  2.0000 3.90   6.61  11.09
5  2.0000 3.6000 6.51   8.98876
6  2.0000 3.70   6.40   9.50000
7  1.90   3.60   6.91  10.096
8  2.000  3.700  7.00  10.6985
9  2.0000 3.60   6.20   9.8994975 = 9.90
10 2.000  3.80   7.300 13.000000000000000

Uri



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