Hello David, Peter,
Thank you so much for taking the trouble to look into this. The user guide
for the *boot.two.per* function contains this statement:
*Obtains an independent-samples confidence interval and (optionally)
performs an independent samples*
*hypothesis test for the difference between two population means, medians,
proportions,*
*or some user-defined function, using the percentile bootstrap method*.
That was why I assumed it could handle the bootstrapped two-sample test for
proportions as well. I actually tried to contact the author before
bringing the issue to R-Help, but found that unfortunately he passed away
in 2016. Assuming there's no resolution to this problem, would you know of
any other package or function that can bootstrap one- and two-sample
proportion tests?
Thanks again!
Janh
On Sun, Nov 25, 2018 at 7:06 PM David Winsemius <dwinsem...@comcast.net>
wrote:
> Look at the function's help page:
>
> No help there. The "parameter" argument is not defined in any
> substantive manner, and no examples other than `parameter=mean` appear
> in the help page.
>
> (Now) Look at the code. The parameter argument is expected to be a
> function. There is no function named `proportion` in base R that I know
> of and:
>
> > wBoot::proportion
> Error: 'proportion' is not an exported object from 'namespace:wBoot'
> > wBoot:::proportion
> Error in get(name, envir = asNamespace(pkg), inherits = FALSE) :
> object 'proportion' not found
>
>
> The code in the function you are asking about does begin with:
>
> {
>
> proportion <- mean
>
> However, that named entity, `proportion`, is never referenced in code
> that follows, so it appears that the package author started down one
> path and then abandoned that line of code and did something else. I
> suspect that the code was written so that `mean` was inteended to
> deliver a test of equal proportions using the normal approximation to a
> binomial test. There is a waring in the help page that would apply to
> situations where the proportion is far from 0.5. You are advised that
> not all packages are written with scrupulous quality control and peer
> review.
>
> You should have read the posting guide. It would have told you that you
> should have addressed your concerns to the package author first, and
> also posted in plain text.
>
> --
>
> David
>
> On 11/25/18 12:59 PM, Janh Anni wrote:
> > Hello R Experts!
> >
> > I wonder if anyone is familiar with the wBoot package written by Neil
> > Weiss. I was trying to use the *boot.two.per* function in that package to
> > compute a bootstrapped two-sample hypothesis test for proportion. Here"s
> > the *boot.two.per* script:
> >
> > boot.two.per(x, y, parameter, stacked = TRUE, variable = NULL,
> >
> > null.hyp = NULL, alternative = c("two.sided", "less", "greater"),
> >
> > conf.level = 0.95, type = NULL, R = 9999)
> >
> > The problem is that if I specify *mean* or *median *as the parameter for
> > the test, the script runs fine, but if I specify *proportion*, I get an
> > error message that *proportion* not found
> >
> > Is there another way to specify proportion as the test parameter?
> >
> > Thanks a lot!
> >
> > Janh
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>
> ______________________________________________
> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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