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Re: Newbie's question [message #45985 is a reply to message #45924]

Fri, 21 October 2005 10:19

James Kuyper
Messages: 425
Registered: March 2000

Senior Member

ChiChiRuiz@gmail.com wrote:
> I agreed that it's more a scientific problem, rather than a numerical
> one. It'd just never crossed my mind that it would be this
> complicated. The x, y arrays are values from different images over the
> same pixel location, because of the stats analysis to produce these
> values, they "SHOULD" have a y=x^2 relationship, but due to large
> analytical errors, I know it's not exactly y=x^2. I just want to get a
> general idea for the scatter plot.

I still think that it's likely that you're doing the wrong kind of
analysis. However, I can't be sure, and I can't suggest an alternative,
unless I know a little bit more about what these numbers actually mean.

When you say "images", I tend to think of something which, at the
fundamental level, is incapable of having negative values. Background
subtraction can produce negative values, and dealing with that in a
fashion that doesn't bias your statistics is a tricky issue. However, I
got the impression from your comments that the negative values were
pretty common, and of a magnitude similar to that of your positive
values.

It also would help if we knew what you were planning to do with this
number once you've calculated it. The right number to calculate, and
the best way to calculate it, often depends upon how you plan to use
that number.

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[Message index]

		Newbie's question By: ChiChiRuiz@gmail.com on Wed, 19 October 2005 15:06
		Re: Newbie's question By: James Kuyper on Fri, 21 October 2005 15:06
		Re: Newbie's question By: ChiChiRuiz@gmail.com on Fri, 21 October 2005 11:22
		Re: Newbie's question By: James Kuyper on Fri, 21 October 2005 10:29
		Re: Newbie's question By: James Kuyper on Fri, 21 October 2005 10:19
		Re: Newbie's question By: JD Smith on Fri, 21 October 2005 09:35
		Re: newbie's question By: geonline714 on Sat, 14 April 2007 11:08
		Re: newbie's question By: David Fanning on Sat, 14 April 2007 10:04

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