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  • $\begingroup$ Another question I came across that didn't really help much: stats.stackexchange.com/questions/82059/… $\endgroup$ Commented Aug 28, 2014 at 17:15
  • $\begingroup$ Does this question help? stats.stackexchange.com/questions/25299/… $\endgroup$ Commented Aug 28, 2014 at 17:32
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    $\begingroup$ In R, you could use prop.test: prop.test(c(1556, 1671), c(2455, 2730)). $\endgroup$ Commented Aug 28, 2014 at 17:48
  • 3
    $\begingroup$ Could be done as a two-sample (binomial) proportions test, or a 2x2 chi-square $\endgroup$ Commented Aug 28, 2014 at 17:58
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    $\begingroup$ Extending the base case from two groups to three could be problematic, because the tests will be interdependent: you will need a binomial version of ANOVA to handle that. $\endgroup$ Commented Mar 21, 2016 at 1:42