[R] binom.test inside ctest

Mai Zhou mai at ms.uky.edu
Tue Sep 12 06:22:47 CEST 2000

I got 

binom.test(65, 100, p=0.5)

p-value = 0.002654

I thought in this case (when p=0.5 so a symmetric distribution)
we should get 

p-value = 2*( 1-pbinom(64, 100, p=0.5) ) = 0.003517642

Can somebody explain why the difference?


Mai Zhou
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