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Two-sample test for independent proportions - using R

Two-sample test for independent proportions


The application prop.test in R outputs the chi square statistic as the test statistic along with the confidence interval for the difference. The data should be provided as a matrix with 2 columns giving the counts of successes and failures, respectively.

Gives something like this:

2-sample test for equality of proportions with continuity correction data: tab1 X-squared = 2.7412, df = 1, p-value = 0.09779 alternative hypothesis: two.sided 95 percent confidence interval: -0.50722061 0.02722061 sample estimates: prop 1 prop 2 0.12 0.36