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Re: HISTOGRAM and the Razor's Edge. [message #35450 is a reply to message #35449]

Thu, 12 June 2003 07:30

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Craig Markwardt writes:

> Partial solution number one: use double precision.
>
> Partial solution number two: multiply all values by (1+EPS)
> where EPS = (MACHAR()).EPS (or equivalent double version)
> (assumes you always want to round "up" to the next bin)
>
> Partial solution number three: add a random deviate to each value
> (doesn't solve the razor's edge problem per se, but reduces the
> chances that a human-entered quantity will land on a bin-edge, and
> reduces the bias of always rounding "up" to the next bin)
>
>
> Partial solution number four: work in powers of 2 instead of multiples
> of 0.05.
>
> Partial solution number five: learn to live with it.

It's been a few months. Everyone ought to have another
go at the Sky is Falling article and the good links
therein:

http://www.dfanning.com/math_tips/sky_is_falling.html

Cheers,

David

--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Re: HISTOGRAM and the Razor's Edge. By: Paul Van Delst[1] on Fri, 13 June 2003 06:58
		Re: HISTOGRAM and the Razor's Edge. By: JD Smith on Thu, 12 June 2003 15:25
		Re: HISTOGRAM and the Razor's Edge. By: timrobishaw on Thu, 12 June 2003 14:54
		Re: HISTOGRAM and the Razor's Edge. By: meinel on Thu, 12 June 2003 08:03
		Re: HISTOGRAM and the Razor's Edge. By: Paul Van Delst[1] on Thu, 12 June 2003 07:40
		Re: HISTOGRAM and the Razor's Edge. By: David Fanning on Thu, 12 June 2003 07:30
		Re: HISTOGRAM and the Razor's Edge. By: James Kuyper on Thu, 12 June 2003 06:53
		Re: HISTOGRAM and the Razor's Edge. By: R.G. Stockwell on Thu, 12 June 2003 04:33
		Re: HISTOGRAM and the Razor's Edge. By: Craig Markwardt on Thu, 12 June 2003 00:04

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