The confidence interval calculation in prop.test appears to be
incorrect when alternative="greater". The upper limit is always set
to 1.000. Am I missing something?
> total=c(250,250)
> success=c(55,31)
> prop.test(success,total,alternative="greater",correct=TRUE)
2-sample test for equality of proportions with continuity correction
data: success out of total
X-squared = 7.4289, df = 1, p-value = 0.003209
alternative hypothesis: greater
95 percent confidence interval:
0.03693065 1.00000000
sample estimates:
prop 1 prop 2
0.220 0.124
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