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Lee Simon

2021-Jun-06 08:29 UTC

[R] Help for Use of R software

Dear Sir/Madam,

May I seek for your kind help for the use of R software for conducting
two-proportional z-test which is test for non-inferiority? I have found one
saying using function (TwoSampleProportion.NIS(alpha, beta, p1, p2, k,
delta, margin) but the software said there is not such function. Thank you
very much for your kind help.

With kindest regards,
Simon

	[[alternative HTML version deleted]]

David Winsemius

2021-Jun-06 17:44 UTC

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[R] Help for Use of R software

A google-search of the term brings up as its first hit a link to a page 
on the rdocumentation.org website that indicates that theTrialSize 
package(version1.4) 
<https://www.rdocumentation.org/packages/TrialSize/versions/1.4> has a 
function named "TwoSampleProportion.NIS".

If you executed these commands in an R console:

install.packages("TrialSize")
packageDescription("TrialSize")
library(TrialSize)
?TwoSampleProportion.NIS

.... you would probably see a help page that has almost the same content 
as the page at rdocumentation.org

(A "two sample z-test", at least as I understand such a label, is not 
necessarily a test for non-inferiority. That page doesn't actually 
describe the results of a calculation using the 
"TwoSampleProportion.NIS" function but if you go to the code you find 
it's not doing a test of any sort but rather doing an oversimplified 
sample size calculation.)

You appear to not understand that R is a system of packages that are 
optionally installed and loaded into the core programming environment. I 
would advise that you do some self-learning about how to use R (or) that 
you contract with a person who can provide the skills need to both 
educate you about the statistical issues in trial design and run your 
analyses for you.

You should also read the fine Posting Guide:

http://www.R-project.org/posting-guide.html

-- 

David.

On 6/6/21 1:29 AM, Lee Simon wrote:> Dear Sir/Madam,
>
> May I seek for your kind help for the use of R software for conducting
> two-proportional z-test which is test for non-inferiority? I have found one
> saying using function (TwoSampleProportion.NIS(alpha, beta, p1, p2, k,
> delta, margin) but the software said there is not such function. Thank you
> very much for your kind help.
>
> With kindest regards,
> Simon
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at 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.

Sorkin, John

2021-Jun-06 18:03 UTC

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[R] Help for Use of R software

Simon,

I suggest you look at the web page
https://cran.r-project.org/web/packages/SampleSize4ClinicalTrials/SampleSize4ClinicalTrials.pdf
The package SampleSize4Clinical Trials appears to be exactly what you want. I
believe it can produce a sample size estimate comparing two proportions for
non-inferiority.

John

John David Sorkin M.D., Ph.D.
Professor of Medicine
University of Maryland School of Medicine
Associate Director for Biostatistics and Informatics Baltimore VA Medical Center
Geriatrics, Research, Education, and Clinical Center
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology, Geriatrics
and Palliative Care
Senior Statistician
University of Maryland Center for Vascular Research
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)



________________________________________
From: R-help <r-help-bounces at r-project.org> on behalf of Lee Simon
<simonleelee123456 at gmail.com>
Sent: Sunday, June 6, 2021 4:29 AM
To: r-help at r-project.org
Subject: [R] Help for Use of R software

Dear Sir/Madam,

May I seek for your kind help for the use of R software for conducting
two-proportional z-test which is test for non-inferiority? I have found one
saying using function (TwoSampleProportion.NIS(alpha, beta, p1, p2, k,
delta, margin) but the software said there is not such function. Thank you
very much for your kind help.

With kindest regards,
Simon

        [[alternative HTML version deleted]]

______________________________________________
R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
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PLEASE do read the posting guide
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and provide commented, minimal, self-contained, reproducible code.

R help - Jun 2021 - Help for Use of R software

[R] Help for Use of R software

[R] Help for Use of R software

[R] Help for Use of R software