### PROPORTIONS TEST FOR TWO INDEPENDENT SAMPLES

### DESCRIPTION:
###    Tests whether underlying proportions are equal.

### REQUIRED ARGUMENTS:
###    x = vector of 2 elements containing the number of successes for each sample.
### 	n = vector of 2 elements containing the total number of trials for each sample.
###    NOTE:  the elements in the x vector must correspond to the elements
###           in the n vector.
###    conf.level = desired confidence level
###    alternative = "two.sided", "greater", "less"   (choose 1)


x <- c(57,142)

n <- c(200745,201229)

alternative <- "two.sided"

conf.level <- .95

prop.test(x,n,alternative=alternative,conf.level=conf.level,correct=T)