On a new transformation to normality |
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Authors: | Panagis G Moschopoulos |
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Institution: | The University of Texas at Dallas , Richardson, Texas, 75080 |
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Abstract: | A Gaussian approximation to the distribution of the nonnegative random variable Y is developed using the Wilson and Hilferty (1931) approach. This approximation uses the symmetrizing transformation ((Y + b)/k1)h where k1 is the first moment of Y and h and b are determined from the first three cumulants of Y. The approximation is illustrated in the case which Y is a non-central chi-square, where numerical evaluations indicate that the new transformation is an improvement over existing ones, especially for small values of k1. |
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Keywords: | Wilson-Hilferty approximation cumulants non-central chi-square |
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