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Re: Random testing [message #52065 is a reply to message #52063]

Tue, 02 January 2007 07:24

news.verizon.net
Messages: 47
Registered: August 2003

Member

Joshua wrote:
> Does anybody know how to test
> a binary mask for spatial randomness?
> All I'm trying to do is see whether the 1's are spatially random
> or systematic.

I assume that you are refering to a 2-d mask. You might want to look
at Section 14.7 of "Numerical Recipes" titled "Do Two-Dimensional
Distributions differ?", which provides code for the 2-d K-S test.
Their example model function (quadv1) is a uniform 2-d random
distribution. Unfortunately, I am not aware of an IDL
implementations of this code. (Also check the bug fix at low number
counts given in
http://www.numerical-recipes.com/forum/showthread.php?t=576).

You could also just test the 1-d distributions of X and Y for
randomness, for example, by using the ksone.pro procedure at
http://idlastro.gsfc.nasa.gov/ftp/pro/math/. But this will not rule
out any non-random correlation between X and Y. --Wayne

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		Re: Random testing By: James Kuyper on Tue, 02 January 2007 08:20
		Re: Random testing By: news.verizon.net on Tue, 02 January 2007 07:24

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