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
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