[R] prop.test correct true and false gives same answer

[Albyn Jones]

?prop.test is helpful.

"Continuity correction is used only if it does not exceed the
difference between sample and null proportions in absolute value."

albyn

On Wed, Mar 27, 2013 at 02:04:51PM -0700, David Arnold wrote:
> All,
> 
> How come both of these are the same.  Both say "1-sample proportions test
> without continuity correction." I would suspect one would say "without" and
> one would say "with."
> 
> 
> > prop.test(118,236,.5,correct=FALSE,conf.level=0.95)
> 
> 	1-sample proportions test without continuity correction
> 
> data:  118 out of 236, null probability 0.5 
> X-squared = 0, df = 1, p-value = 1
> alternative hypothesis: true p is not equal to 0.5 
> 95 percent confidence interval:
>  0.4367215 0.5632785 
> sample estimates:
>   p 
> 0.5 
> 
> > prop.test(118,236,.5,correct=TRUE,conf.level=0.95)
> 
> 	1-sample proportions test without continuity correction
> 
> data:  118 out of 236, null probability 0.5 
> X-squared = 0, df = 1, p-value = 1
> alternative hypothesis: true p is not equal to 0.5 
> 95 percent confidence interval:
>  0.4367215 0.5632785 
> sample estimates:
>   p 
> 0.5 
> 
> 
> 
> 
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-- 
Albyn Jones
Reed College
jones at reed.edu