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skewreduction.m- skewness reduction (transformation method) 1.0

  Date Added: August 19, 2013  |  Visits: 196

skewreduction.m- skewness reduction (transformation method)

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Skewness ReductionUSAGE: [xt r sk]=skewreduction(x)Input:x: original data (skewed data) - x should be positive. If some of the observations are negative the following transformation can be used before skewness reduction x=x-min(x)Outputs:xt: transformed data (data with skewness close to 0)r: a root in which xt=x.^rsk: skewness of transfomed dataThis function tranform x (a skewed data) to xt in which xt has skewness close to zero. This is useful to trasform skewed (non-normal) data to normal (or close to normal)data.Example 1 (x has positive skewness):x=gamrnd(1,4,1,1000);[xt r sk]=skewreduction(x)Example 2 (x has negative skewness):x=wblrnd(3,20,1,1000);[xt r sk]=skewreduction(x)______________________________________Copyright(c) Babak Abbasi, RMIT University, 2011References:1-Niaki, S.T.A and Abbasi, B., 2007, Skewness Reduction Approach in Multi-Attribute Process MonitoringCommunications in Statistics - Theory and Methods Volume 36, Issue 12, 20072- Hosseinifard S.Z., Abbasi B., Ahmad S., Abdollahian M., 2009, A transformation technique to estimate the process capability index for non-normal processes , International Journal of Advanced Manufacturing Technology 40 (5-6), 512-517.

Requirements: No special requirements
Platforms: Matlab
Keyword: Approach Babak Communications Methods Monitoring Multiattribute Process Statistics Theory Volume
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License: Shareware Size: 10 KB
SKEWREDUCTION.M- SKEWNESS REDUCTION (TRANSFORMATION METHOD) RELATED
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