[R-meta] Fwd:

[Im]

Dear Prof Michael and All!
Thanks a lot for your much valuable suggestions.

I have been away from R for some time now and used SPSS for my statistical
work.
Ńow the problem is that the "metap" package is not being read after
installation and says *"Error in library(metap) : there is no package
called ‘metap’"*.
Please let me know which R software version and doamin (CRAN Mirrors) will
load "metap" package ?

I will be much grateful for this.
best regards,
Imran


On Tue, Sep 28, 2021 at 3:47 PM Michael Dewey <lists using dewey.myzen.co.uk>
wrote:

> Dear Imran
>
> The code which you present does not seem to correspond to the problem
> you state you are having. I think you would be best to find a colleague
> who can help you with basic R. I have put some comments in below to
> start you off.
>
> On 28/09/2021 11:20, Awais Wahab wrote:
> > Hello!
> > I need some help please.
> > I have 5-6 one sided P-values from different studies and need to do their
> > meta-analysis.
> >
> > I am using these (Example) codes in R as below, but they are not working,
> >
> > *> library(metap)*
> >
> > *pvals <- c(0.1, 0.1, 0.9, 0.9, 0.9, 0.9)  *
> >
>
> OK so you have loaded the package and set up a vector pvals with your
> p-values.
>
> > *> istwo <- c(TRUE, FALSE, TRUE, FALSE, TRUE, FALSE)*
> >
> > *> toinvert <- c(FALSE, TRUE, FALSE, FALSE, TRUE, TRUE)*
> >
> > *> two2one(pvals, two = istwo, invert = toinvert)*
> >
>
>
> In the text you said they were all one-sided so why are you using the
> two2one function to convert some of them from two-sided to one-sided?
>
> > *> print(validity)*
> >
> > *> plotp(validity)*
> >
> > *> schweder(validity)*
> >
>
>
> The validity dataset is provided with the package to use in examples. It
> has nothing to do with your problem at all.
> >
> > *OR this below,*
> >
> >
> >
> > *Fisher's method, T =
> -2*log(p-value1)-2*log(p-value2)-...-2*log(p-valuem)
> > where m is the number of p-values. Under the null hypothesis, this will
> be
> > distributed as chi-squared with m degrees of freedom, so you would then
> do
> > T.pval = 1-pchisq(T,m)*
> >
> >
>
> why not do
>
> result <- sumlog(pvals)
>
> at this point and then print result?
>
> Just for the record Fisher's method may not be the most suitable one for
> your scientific question but now you can replace sumlog with one of the
> other functions.
>
> > Are these codes correct ?  I am not sure where exactly to put my
> p-values.
> > It will be great if someone can help me with the correct codes.
> >
> >
> > I will be much grateful for your kind support.
> >
> > best regards.
> >
> > On Tue, Sep 28, 2021 at 11:27 AM Dr. Gerta Rücker <
> > ruecker using imbi.uni-freiburg.de> wrote:
> >
> >> Hi Imran,
> >>
> >> There was already an answer by Michael Dewey with a useful link to
> >> MetaAnalysis Task View https://cran.r-project.org/view=MetaAnalysis
> >>
> >> Best,
> >>
> >> Gerta
> >>
> >> Am 28.09.2021 um 10:06 schrieb Awais Wahab:
> >>> Hello!
> >>>
> >>> Is it possible to perform meta-analysis with available P-values in each
> >>> study as effect size, instead of HR, OR etc. ?
> >>>
> >>> Thanks in advance.
> >>> Best regards,
> >>> Imran
> >>>
> >>>        [[alternative HTML version deleted]]
> >>>
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> >>
> >> --
> >>
> >> Dr. rer. nat. Gerta Rücker, Dipl.-Math.
> >>
> >> Guest Scientist
> >> Institute of Medical Biometry and Statistics,
> >> Faculty of Medicine and Medical Center - University of Freiburg
> >>
> >> Zinkmattenstr. 6a, D-79108 Freiburg, Germany
> >>
> >> Mail:     ruecker using imbi.uni-freiburg.de
> >> Homepage:
> >>
> https://www.uniklinik-freiburg.de/imbi-en/employees.html?imbiuser=ruecker
> >>
> >>
> >
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