[R] binom.test inside ctest

[Mai Zhou]

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?

Thanks.

Mai Zhou
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