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Biometrika 1969 56(2):255-272; doi:10.1093/biomet/56.2.255
© 1969 by Biometrika Trust
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Tables of percentage points of non-central x

N. L. JOHNSON and E. S. PEARSON

University of North Carolina and University College London

The lower and upper 5, 2.5, 1.0 and 0.5% points of tho distribution of non-central x are given for degrees of freedom v=1(1) 12, 15, 20 and non-centrality parameter {surd}{lambda}=0.0(0.2)6.0, 8.0, 10.0. Approximations which may be used outside the limits of the tables are discussed as well as methods of interpolation for {surd}{lambda} and v within these limits. Some examples of the use of the tables are givben and an examination is made of the accuracy of the approximation to the distribution of multiple R suggested by R.A. Fisher.


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