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AnDarksamtest 1.0

  Date Added: May 14, 2013  |  Visits: 364

AnDarksamtest

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Anderson and Darling (1952, 1954) introduced a goodness-of-fit statistic to test the hypothesis that a random sample comes from a continuous population with a specified distribution function. It is a modification of the Kolmogorov-Smirnov (K-S) test and gives more weight to the tails than the K-S test.The corresponding two-sample version was proposed by Darling (1957) and studied in detail by Pettitt (1976).The Anderson-Darling k-sample test was introduced by Scholz and Stephens (1987) as a generalization of the two-sample Anderson-Darling test. It is a nonparametric statistical procedure, i.e., a rank test, and, thus, requires no assumptions other than that the samples are true independent random samples from their respective continuous populations (although provisions for tied observations are made). It tests the hypothesis that the populations from which two or more independent samples of data were drawn are identical. This test can be used to decide whether data from different sources may be combined, because they are judged to come from one common distribution, i.e., the null hypothesis Ho of same population distributions cannot be rejected. In its opposite use, it can be seen as a generalization of a one-way ANOVA for which the k-sample Kruskal-Wallis test (1952, 1953) is the most commonly used rank test.It is an omnibus test because of its effectiveness against all alternatives to the null hypothesis Ho's (all k populations being equal). For example, it is effective for changes in scale while locations are matched, which is a weakness of the Kruskal-Wallis test.The Anderson-Darling k-sample procedure assumes that i-th sample has a continuous distribution function and we are interested in testing the null hypothesis that all sampled populations have the same distribution without specifying the nature of that common distribution.The observed k-sample Anderson-Darling statistic (ADK) is standardized using its exact sample mean and standard deviation to remove some of its dependence on the sample size. We note another mathematical expressions found in the literature, as MIL-HDBK-17-1E (1997).The approximate P-value of the observed ADK statistic can be calculated using a spline interpolation method. For the interested users, we are also including, as a comment, the mathematical procedure to get the ADK critical value.We give the Anderson-Darling k-sample procedure with and without adjustment for ties.Finally, we compare the P-value with the desired significance level alpha to facilitate a decision about the null hypothesis Ho.Syntax: function AnDarksamtest(X,alpha) Inputs:X - data matrix (Size of matrix must be n-by-2; data=column 1,sample=column 2)alpha - significance level (default = 0.05)Output:- Complete Anderson-Darling k-sample test

Requirements: No special requirements
Platforms: Matlab
Keyword: Exact Mathematical Nature Observed Sampled Standard Standardized
Users rating: 0/10

License: Shareware Size: 10 KB
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