[R-meta] Meta-analysis Hedges g - comparisons with same placebo

[P. Roberto Bakker]

Thank you for your reply.
Yes, I mean something along the lines of http://www.metafor-project.
org/doku.php/analyses:morris2008

2017-10-19 20:42 GMT+02:00 Viechtbauer Wolfgang (SP) <
wolfgang.viechtbauer at maastrichtuniversity.nl>:

> 1) Ni is the total sample size of a study. For multitreatment studies,
> this is the control group size plus the sizes of the treatment groups.
>
> 2) Unfortunately, no. The code given there is specifically for the
> standardized mean difference (for two or more independent groups). The
> equations (and hence code) will be different when the outcome measure is
> the difference between the standardized mean changes for the various
> groups; I assume you mean something along the lines of:
>
> http://www.metafor-project.org/doku.php/analyses:morris2008
>
> Best,
> Wolfgang
>
> -----Original Message-----
> From: P. Roberto Bakker [mailto:robertobakker at gmail.com]
> Sent: Thursday, 19 October, 2017 19:25
> To: Viechtbauer Wolfgang (SP)
> Cc: r-sig-meta-analysis at r-project.org
> Subject: Re: [R-meta] Meta-analysis Hedges g - comparisons with same
> placebo
>
> It is a nice code. Thank you.
>
> Some questons:
> 1. N1 is not always n1i+n2i - how can I interpret this?
>
> 2. I am analysing standardized mean deference change - I suppose I can use
> the syntax also, correct?
>
> Cheers, Roberto
>
> 2017-10-19 10:26 GMT+02:00 Viechtbauer Wolfgang (SP) <
> wolfgang.viechtbauer at maastrichtuniversity.nl>:
> There is also code for computing the covariance among the standardized
> mean differences in such 'multitreatment' studies here:
>
> http://www.metafor-project.org/doku.php/analyses:gleser2009
>
> Best,
> Wolfgang
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