[R-meta] Proportional meta-analysis

[Ahmed Tarek]

Dear All,

In a previous email I have been explaining about a proportional meta analysis I have been performing. I am working on comparing the retention rates of different materials. I first took the approach of grouping different materials with similar follow up times , and calculating a summary proportion of all materials, however I later found out that performing a moderator analysis ( in this case “materials”) would only compare the materials against the summary proportion (?) , which is not my aim. I aim to see how each material performed, and compare directly between them. For example, I have materials A,B,C,D and I wish to compare the retention between A and B, to see if they are significantly different. 

So I am thinking I should calculate a summary proportion for each material alone, and then perhaps conduct a chi square test? to see if the summary means of each material is different? 

I would really appreciate any input. 
Attached is the summary proportion of all materials reporting retention after 3 years. For my paper, I want to highlight that the GI material is significantly worse than the Auto material. Could I still do that with moderator analysis?

Regards,
Ahmed Bedir

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://stat.ethz.ch/pipermail/r-sig-meta-analysis/attachments/20180209/3bf0dbc9/attachment-0001.html>

-------------- next part --------------
A non-text attachment was scrubbed...
Name: forestplot_meta2yearsnew5Novembernoout.png
Type: image/png
Size: 350537 bytes
Desc: not available
URL: <https://stat.ethz.ch/pipermail/r-sig-meta-analysis/attachments/20180209/3bf0dbc9/attachment-0001.png>