Questions tagged [nonparametric]
Use this tag to ask about the nature of nonparametric or parametric methods, or the difference between the two. Nonparametric methods generally rely on few assumptions about the underlying distributions, whereas parametric methods make assumptions that allow data to be described by a small number of parameters.
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Types of parameters of a parametric family of probability distributions
A statistical parameter is a quantity that indexes a family of probability distributions.
Wikipedia has the following definition of a shape parameter:
A shape parameter is any parameter of a ...
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What are the differences between parametric and non-parametric statistical tests?
I have seen that there are parametric and non-parametric statistical tests. What are the differences between them?
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Bias of kernel density estimator of pdf $f$, where $f$ has bounded first derivative $f'$
Let's say the kernel density estimator is given by
$$\hat f(x) = \frac{1}{nh_n} \sum_{i=1}^n K\left(\frac{X_i-x}{h_n}\right),$$ where $h_n \to 0$, $nh_n \to \infty$, $K$ a symmetric probability ...
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How to compare several means to control when the distribution is not normal and sample sizes are unequal?
I have a large dataset (n = 170,000), distributed roughly equally among 5 groups (each is 34,000 ± ~1,000). I want to compare whether the means in any of the first 4 groups are different from the ...
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non-parametric test: proof of Friedman's statistic
I am asked to prove that the Friedman statistic has two equivalent forms, namely:
$$
\Large
\begin{aligned}
S &= \frac{12n}{k(k+1)}\sum_{j=1}^k\left(R_{.j}-\frac{k+1}{2}\right)^2\\
&= \left[\...
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Kendall's W for a series of answers about the same phenomenon in different entities
I have a question about the proper usage of Kendall's coefficient of concordance (Kendall's W). Suppose a series of questions were asked how democratic certain organisations are. Each question was the ...
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teststatistic vs linearstatistic in wilcoxsign_test
In R, wilcoxsign_test in library coin calculates both a "teststatistic" (output as "Z") and a "linearstatistic" (I think this is ...
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Non parametric analysis
The my dataset is not normal distributed. In order to apply a non parametric analysis, exist only the Kruskal Wallis test or others?
I need to find a test similar to ANOVA to apply a dataset not ...
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non-parametric alternatives to anova [duplicate]
Hello I am doing some stats on some research I did and was having trouble picking the correct statistical tests to use.
The question I am trying to answer is, I have two cell types (I, II) and two ...
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Which test to use for non-normal paired data, with different sample sizes?
I posted a similar question yesterday, but was brought to my attention that I may need to consider the variance of my samples.
I swabbed 9 rooms (3 cold/6 hot) for bacteria. The bacteria was counted ...
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