Talk:Poincaré plot

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I am no math whiz, so if the Poincare plot is a subset of a recurrence plot or something, maybe this article should be a section in that article, instead of its own article. Rhetth (talk) 17:15, 7 February 2009 (UTC)[reply]

I don't think these are recurrence plots at all.

The article is written in a way that can only keep a reasonable reader guessing as to what it says. Via google I've been slowly piecing this together. Michael Hardy (talk) 18:50, 9 February 2009 (UTC)[reply]

It does sound a lot like a recurrence plot. The image below (from that article) certainly "... is a plot of F(n) on the X axis vs. F(n + 1) on the Y axis."

The confusing thing is that this article seems to simply consider the special case where F(n) relates to an electrocardiogram. I suggest that this article be merged into recurrence plot as a special section on recurrence plots for electrocardiograms.

-- Radagast3 (talk) 11:43, 31 August 2009 (UTC)[reply]

Recurrence plot of the Southern Oscillation index.

You're just writing nonsense. The recurrence plot of the Southern Oscillation that you're displaying here is clearly not a plot of F(n) on the X axis vs. F(n + 1) on the Y axis. If you think that's what it is, you're not paying attention at all. Michael Hardy (talk) 23:14, 31 August 2009 (UTC)[reply]

But what IS a Poincaré plot??

The glaring deficiency of this article in its present form is that it doesn't even attempt to give the slightest hint at the answer to the question: What is a Poincaré plot?

Nor does it attempt to say what "R-R" means, while using that notation repeatedly and prominently. Michael Hardy (talk) 18:42, 9 February 2009 (UTC)[reply]

OK, via Google I'm finding "R-R intervals are times between peaks in certain electrocardiograms. It's starting to come together. The article is not clear, but detective work can be done. Michael Hardy (talk) 18:52, 9 February 2009 (UTC)[reply]

One of the problems here may be that other names are used for the same thing in other fields: one of the things I found via Google lists the following as "Synonyms" ... Scatter plot; scattergram; Return map; phase delay map; Lorenz plot. In addition, a book I have suggested that "delay map" was used in physics for what seems to be a similar idea but without itself giving a name for it. Perhaps the first two can be discounted as too general. Melcombe (talk) 11:02, 10 February 2009 (UTC)[reply]

Well, obviously this is not synonymous with "scatter plot". Michael Hardy (talk) 22:32, 10 February 2009 (UTC)[reply]

Statistics?

I wonder if this should be a part of Wikiproject Statistics, or if it should also be Wikiproject Mathematics? Rhetth (talk) 18:01, 15 August 2009 (UTC)[reply]

Heart Rate Variability

The article states "An increase in the variability of heart rate suggests pathological conditions" but the linked study supports the opposite conclusion, I believe. Other articles on Wikipedia say that decrease of variability is associated with various poor health outcomes, so this section seems inconsistent with other sources. Perhaps an expert could update that section.