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. Author manuscript; available in PMC: 2010 May 15.
Published in final edited form as: Comput Stat Data Anal. 2009 May 15;53(7):2446–2452. doi: 10.1016/j.csda.2008.11.028

Figure 2.

Figure 2

Log relative error (LRE) plotted against the x supplied to the CDF call of GSL to obtain the upper tail P{X>=x} for the Chi-square distribution with df=1. Illustrates how complementation error affects the accuracy if the tail area is computed by complementation instead by the direct method.