inst/snippet/binomial-ztest.R

In rpruim/fastR2: Foundations and Applications of Statistics Using R (2nd Edition)

# "exact" p-value
binom.test(60, 100)
# approximate p-value
z <- (0.6 - 0.5) / sqrt(0.5 * 0.5 / 100); z
2 * (1 - pnorm(z))                         

# approximate p-value with continuity correction
z <- (0.595 - 0.5) / sqrt(0.5 * 0.5 / 100); z   # 0.595 = 59.5 / 100
2 * (1 - pnorm(z))                         

# R can automate the approximate version too:
prop.test(60, 100)            # uses continuity correction by default
prop.test(60, 100, correct = FALSE)     # turn off continuity correction