Transcription of Normal Probability Plots and Tests for Normality
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Normal Probability Plots and Tests for Normality
Normal Probability Plots and Tests for Normality Thomas A. Ryan, Jr. and Brian L. Joiner, Statistics Department, The Pennsylvania State University 1976 Acknowledgments: Helpful assistance from Dr. Barbara Ryan and discussions with Dr. James J. Filliben and Dr. Samuel S. Shapiro are gratefully acknowledged. Please see Dr. Thomas Ryan's Note on a Test for Normality at the end of this document. Introduction Normal Probability Plots are often used as an informal means of assessing the non- Normality of a set of data.
Since = 0, Rp can be simplified to , or where s2 denotes the sample variance. Filliben [9, 10] suggested plotted the {Yi} against {Ci} where Ci is the median of the ith order statistic in samples from the standard normal distribution.
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