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for non-parametric statistics is very useful for someone who wants a quick idea of what the term means; and the article is there to provide that information. Category pages rarely have more than a few lines text, that's just not their function. I agree that the article is basically just a list at the moment, but it might improve if people start adding more information. For instance, on the history or methodology of non-parametric statistics; or when to choose which test. That stuff should go here, and not on the category page.
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Higgins, Gibbons & Chakraborti to name a few) seems testimony enough. If you want to get enough material to write a good page on this subject, discussing what identifies the nonparametric approach as a coherent approach, and what advantages it offers over parametric approaches, I suggest reading the prefaces and first couple chapters of each of these three books. I am actually working through these books right now and I may work on this page when I have the time...but I
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The opening of this article is fairly terrible. What is the "they" referred to in the 2nd sentence? Do non-para stats include certain types of inferential and descriptive stats? "Not based on parameterized families of probability distributions"...this can certainly be more easily explained to people
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My point is, what more would you say about the topic? The topic itself is really just a category of knowledge, and other than providing a list of topics that fit under it (which is what a category page would do), I don't see what else you would want to write. I say, if you can come up with something
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3. Rank methods are not always non-parametric. The Mann-Whitney-Wilcoxon U test is rather a "semi-nonparametric" because it is held under assumption that the two samples have the same scale parameter values. It is very important assumption. Two samples can strongly differ by scale and have the same
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Hi Chris, thanks for your message. Rather than moving the text here to the
Category page, shouldn't the conclusion be that this article needs to be improved? I don't think an article should ever redirect to a category, because they serve different functions. For instance, the definition given here
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I disagree, I think nonparametric statistics may be a vague field with unclear boundaries, but I think it is nonetheless a discipline, approach or perspective in and of its own right. The fact that there are a myriad of textbooks with titles like "Non-parametric statistics" (e.g. by
Wasserman,
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1. Nonparametric tests are more powerfull than parametric when the assumptions of the parametric tests are not met. This is measured by, for example, Pitman asymptotic relative efficiency. If we compare rank sum test (or U test) with t test, the resuslts of ARE are as follows
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In the part "Methods" the last link ("Wilcoxon signed-rank test"), does not bring you to the desired page, it just causes the text to disappear / re-appear. I tried fixing it myself, but I dit not manage.. I hope somebody can help!
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The worst efficiency scenario for the rank sum test is 0,864; it means that U test will never have lower efficiency bound (relative to t test) than 86,4%. However, the upper bound for U test is infinity compare to the t test!
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What us this supposed to mean? Is it an "in" joke, or some kind of cutesy instructor mnemonic? I have no problem with including such features as long as they are explained from the ground up like everything else.
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normal distribution 0,955 (rank sum test is only 4.5% less efficient) logistic distribution 1,1 (rank sum test is 10% better) uniform distribution 1 Laplace distribution 2 exponential distribution 3 Cauchy ∞
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I'm not convinced by the above reasoning by 83.5.8.69 in point 3. The test will not reject the null of equality between two different but "similarly centered" distributions? Fine, but
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I would like to include a link to a page that expands on the subject of non-parametric estimation with an example of the saturated model. Here you see the short
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who are coming to the article for a basic explanation. I won't rewrite this, but strongly encourage a simple re-writing of the opening sentences for clarity.
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3. Why does this article (and other WP articles) hyphenate the prefix (`non-parametric` rather than `nonparametric`). Dictionaries that I've checked do not.
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There are many wrong statements on this page, however, I do not have time now to fix it. Therefore, I will mention only several crucial errors
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medians. Then the
Kolmogorov-Smirnov (which is a weaker test) will reject the null hypothesis and the Wilcoxon test - will not.
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with which to expand this article, then it might be worthwhile. Otherwise, moving it to the category page is best. —
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In light of these different divisions of the topic, it makes most sense to me to use the following interwiki links:
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it rejects, it gives me an interesting information that doesn't rely on any parametric assumption.
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on
Knowledge. If you would like to participate, please visit the project page, where you can join
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of such test... would suggest it was not orignially semi-parametric. --
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Disclaimer: I'm not particularly expert. That said,
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