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A Fixed Point Method for Finding Percentage Points

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  • Nicholas R. Farnum

Abstract

Iterative methods for finding accurate estimates of percentage points are usually based on numerical root finding techniques applied to the distribution function. In this paper we take a different approach by creating an auxiliary function, whose fixed point is shown to be the desired percentage point, and then applying Steffenson's acceleration technique to find the fixed point. For the auxiliary function used, the conditions for convergence of Steffensen's method are mild and are satisfied by many percentage point problems arising in practice. The method is tested by calculating four‐place χ2 percentage points and two‐place F percentage points which agree with those in published tables.

Suggested Citation

  • Nicholas R. Farnum, 1991. "A Fixed Point Method for Finding Percentage Points," Journal of the Royal Statistical Society Series C, Royal Statistical Society, vol. 40(1), pages 123-126, March.
    • Handle: RePEc:bla:jorssc:v:40:y:1991:i:1:p:123-126
    DOI: 10.2307/2347910
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