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Created Jun 19, 2016
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Calculate P-value
p_value <- function(cdf, z, params=numeric(0), side=0)
n <- length(params)
p <- switch(n+1,
cdf(z, params),
cdf(z, params[1], params[2]),
cdf(z, params[1], params[2], params[3])
if (side < 0) p
else if (side > 0) 1-p
else if (p < 1/2) 2*p
else 2*(1-p)
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