# [R-meta] metafor::vcalc() for multiple sources of dependence

Viechtbauer, Wolfgang (SP) wo||g@ng@v|echtb@uer @end|ng |rom m@@@tr|chtun|ver@|ty@n|
Fri Mar 4 11:45:32 CET 2022

```Hi Simon,

Yes, that's what vcalc() is for.

Best,
Wolfgang

>-----Original Message-----
>From: Simon Harmel [mailto:sim.harmel using gmail.com]
>Sent: Thursday, 03 March, 2022 17:35
>To: Viechtbauer, Wolfgang (SP); R meta
>Subject: metafor::vcalc() for multiple sources of dependence
>
>Hello Wolfgang,
>
>Thank you for adding such an important function! In my studies, I have
>quite a few studies that are structured as shown below.
>
>Can I use vcalc() to construct a V matrix for the three sources of
>dependence (i.e., multiple groups, times, outcomes) in say the study
>below?
>
>Simon
>
>m="
>study yi vi group time outcome
>Brown -0.10 0.05 1 0 1
>Brown 0.24 0.05 1 0 2
>Brown -0.11 0.05 1 0 3
>Brown -0.01 0.05 1 0 4
>Brown -0.12 0.05 2 0 1
>Brown 0.38 0.05 2 0 2
>Brown -0.19 0.05 2 0 3
>Brown 0.30 0.05 2 0 4
>Brown 0.45 0.05 1 1 1
>Brown 0.66 0.05 1 1 2
>Brown 0.27 0.05 1 1 3
>Brown 0.13 0.05 1 1 4
>Brown 0.08 0.05 1 2 1
>Brown 0.25 0.05 1 2 2
>Brown -0.34 0.05 1 2 3
>Brown -0.06 0.05 1 2 4
>Brown 0.48 0.05 2 1 1
>Brown 0.28 0.05 2 1 2
>Brown 0.10 0.05 2 1 3
>Brown 0.25 0.05 2 1 4
>Brown 0.11 0.05 2 2 1
>Brown 0.65 0.05 2 2 2
>Brown 0.39 0.05 2 2 3
>Brown 0.13 0.05 2 2 4"
>