If x1 and n1 are the counts of successes and trials in one sample, and x2 and n2 those in a second one, test the null hypothesis that the success probabilities p1 and p2 are the same.
Under the null, the test statistic z approximately follows a standard normal distribution.
With the optional argument string alt, the alternative of interest
can be selected. If alt is "!=" or "<>", the null
is tested against the two-sided alternative p1 != p2. If
alt is ">", the one-sided alternative p1 > p2 is
used. Similarly for "<", the one-sided alternative
p1 < p2 is used. The default is the two-sided case.
The p-value of the test is returned in pval.
If no output argument is given, the p-value of the test is displayed.
Package: statistics