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Re: HISTOGRAM and the Razor's Edge. [message #35453 is a reply to message #35450]

Thu, 12 June 2003 06:53

James Kuyper
Messages: 425
Registered: March 2000

Senior Member

Tim Robishaw wrote:
...
> So, just when I thought it was safe to start using HISTOGRAM with the
> frequency that Californians use LIKE, I was brought this scary result
> by the guy on the other side of my wall (his name is Tiberius):
>
> IDL> print, histogram([-5.50,-5.45,-5.40,-5.35,-5.30,-5.25],min=-5.50,bi nsize=0.05)
> 1 2 0 2 0 1
>
> Wait a minute, this should be a uniform distribution!
>
> Now, I admit that Tiberius contrived this example with the intent to
> cause harm to HISTOGRAM by placing the values at the exact boundaries
> of each bin. But, we didn't EXPECT it to break! Honest. After

If you expect to get a lot of values that are within round-off error of
being exactly on the boundary values, then your boundary values have
been poorly placed. You should use min=-5.525 for this case.

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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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