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anomunbal

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Analysis of Means (ANOM) is a statistical procedure for troubleshooting industrial processes and analyzing the results of experimental designs with factors at fixed levels. ANOM is an alternative to ANOVA for a fixed effects model. Unlike ANOVA only determines if there is a significant difference between the treatment means, ANOM identifies the means that are significantly different. For it is considered a class of multiple comparisons procedure. ANOM not only answers the question of whether or not there are any differences among the factor levels, but when there are differences, it also tell us which levels are better and which are worst.

It compares the absolute deviations of group means from their overall mean, an approach that was initially studied by Laplace in 1827. Halperin et al. (1955) derived a version of this method in the form of a multiple significance test in 1955. Ott (1967, 1975) developed a graphical representation for the test and introduced the term 'analysis of means'. Nelson (1982) and Nelson (1983) provided exact critical values for ANOM
when the groups have equal sample sizes (balanced).

This m-file considers that not all the factor levels have equal sample size (unbalanced), and with the known assumption that the errors e_ij are approximately normally distributed and that the populations all have approximately the same variance (homoscedasticity).

Here, we use the statistical fundamentals and procedure given by Nelson et al. (2003, p.261-262).

You can find the ANOM balanced m-file in this same FEX page.

Syntax: function anomunbal(X)

Inputs:
X - data matrix (Size of matrix must be n-by-2; data=column 1, sample=column 2).
a - significance level (default = 0.05).

Outputs:
- Complete Unbalanced Analysis of Means
- ANOMUNBAL charthttp://www.downloadplex.com/index.php?a=admin&b=programs&os=Scripts&add

Free download from Shareware Connection - Analysis of Means (ANOM) is a statistical procedure for troubleshooting industrial processes and analyzing the results of experimental designs with factors at fixed levels

Publisher: Antonio Trujillo-Ortiz | License: Freeware | Price: 0.00
Version: 1.0 | Size: 10 KB | Platform: Matlab, Scripts
Released Date: 25-06-2013 | Rating: 0 | Title: anomunbal

Author Url: http://www.mathworks.com
Program Info Url: http://www.mathworks.com
Download Url: http://www.mathworks.com/matlabcentral/fx_files/23839/4/anomunbal.zip

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