How to add a new line of study data to a forest plot?

General
1

Hi everyone. I am currently doing a meta analysis and have created a forest plot with 5 studies so far. I have also created separate forest plots for other studies which I want to now add in to the larger plot. Using the meta, metafor, esc R packages.

Does anyone know if there is a way to add the overall effects obtained in another forest plot (below) to the overall forest plot? I would also need to add the Author/study name and their corresponding effect sizes/standard errors. Any help is appreciated!

SMD 95%-CI %W(random)
Sandberg_2vs1 -0.0849 [-1.1678; 0.9980] 51.6
Sandberg_3vs1 -0.9093 [-2.0412; 0.2226] 48.4

Number of studies combined: k = 2

                     SMD            95%-CI     t p-value

Random effects model -0.4838 [-5.7186; 4.7510] -1.17 0.4491

Quantifying heterogeneity:
tau^2 = 0.1180; tau = 0.3435; I^2 = 6.0%; H = 1.03

Test of heterogeneity:
Q d.f. p-value
1.06 1 0.3023

2

Hi,

Welcome to the RStudio community!

In order for us to help you out, it's important you provide us with data and code we can work with. We like to see what you've already created and how we can reproduce the current issue. Please create a reprex to help us get started. A reprex consists of the minimal code and data needed to recreate the issue/question you're having. You can find instructions how to build and share one here:

Good luck!
PJ

3

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