[R-meta] Effect size using forest plot

[Julie Webbs]

not sure why i could not get this data

dat <- get(data(dat.bonett2010))


On Thu, Dec 13, 2018 at 4:08 PM Viechtbauer, Wolfgang (SP) <
wolfgang.viechtbauer using maastrichtuniversity.nl> wrote:

> Please always include the mailing list in replies.
>
> Not sure what you mean by "not encouraging". But regardless, see
> help(escalc):
>
> The options for the measure argument are then:
>
> - "ARAW" for raw alpha values.
> - "AHW" for transformed alpha values (Hakstian & Whalen, 1976).
> - "ABT" for transformed alpha values (Bonett, 2002).
>
> So, use measure="ARAW".
>
> Best,
> Wolfgang
>
> >-----Original Message-----
> >From: Julie Webbs [mailto:webbsjulie using gmail.com]
> >Sent: Thursday, 13 December, 2018 17:03
> >To: Viechtbauer, Wolfgang (SP)
> >Subject: Re: [R-meta] Effect size using forest plot
> >
> >Hakstian & Whalen is not encouraging for me. you stated:  One can meta-
> >analyze raw alpha values, Can I ask How?
> >
> >On Thu, Dec 13, 2018 at 3:58 PM Viechtbauer, Wolfgang (SP)
> ><wolfgang.viechtbauer using maastrichtuniversity.nl> wrote:
> >Now that is a rather different case. Search help(escalc) for "Cronbach's
> >alpha". Here, one needs to specify the observed alpha values, the number
> >of items/replications/parts of the measurement instrument, and the sample
> >sizes. One can meta-analyze raw alpha values, but it is usually better to
> >apply a transformation, like those described by Hakstian & Whalen (1976)
> >and
> >Bonett (2002).
> >
> >Best,
> >Wolfgang
> >
> >>-----Original Message-----
> >>From: R-sig-meta-analysis [mailto:r-sig-meta-analysis-bounces using r-
> >>project.org] On Behalf Of Gerta Ruecker
> >>Sent: Thursday, 13 December, 2018 16:53
> >>To: Julie Webbs; R meta
> >>Subject: Re: [R-meta] Effect size using forest plot
> >>
> >>Do the Cronbach's alpha values have a standard error?
> >>
> >>Best,
> >>
> >>Gerta
> >>
> >>Am 13.12.2018 um 16:48 schrieb Julie Webbs:
> >>> Yes as an exampel. Some times we have a single value, e.g, Cronbach's
> >>> alpha
> >>>
> >>> On Thu, Dec 13, 2018 at 3:39 PM Gerta Ruecker
> >>> <ruecker using imbi.uni-freiburg.de <mailto:ruecker using imbi.uni-freiburg.de>>
> >>> wrote:
> >>>
> >>>     You mean a mean without SD or sample size? Perhaps I still do not
> >>>     understand what you have.
> >>>
> >>>     Best,
> >>>
> >>>     Gerta
>

	[[alternative HTML version deleted]]