[R-meta] Jitter points in the contour-enhanced funnel plot

[Angeline Tsui]

Dear Michael,

Thank you very much for your reply. I actually tried different plot symbol,
but it didn't help much.

For the jitter function, do you mean that I need to simply use the jitter
function with the effect size or var before running the regression and
later plot the regression model with funnel plot?

Thanks again,
Angeline

On Thu, Jul 19, 2018 at 5:41 AM, Michael Dewey <lists using dewey.myzen.co.uk>
wrote:

> Dear Angeline
>
> The first thing I would try is using a different plot symbol. A hollow
> circle or a cross might help if the points are not absolutely identical.
> The second thing would be to re-run the meta-analysis with the values of yi
> and sei (or vi) with added jitter, perhaps using the jitter() function for
> that.
>
> Michael
>
> On 18/07/2018 14:58, Angeline Tsui wrote:
>
>> Dear all,
>>
>> I plotted the studies in my meta-analysis in a contour-enhanced funnel
>> plot. In my meta-analysis, I have about 140 studies. However, when I plot
>> the funnel plot, I find that a number of studies (i.e., points) overlapped
>> with each other in the plot and this leads to an illustration that I am
>> not
>> plotting all studies in the funnel plot.
>>
>> So I am writing to ask if you can teach me how to jitter points in the
>> funnel plot, so that there could be some spaces between studies with
>> similar effect size?
>>
>> Thanks,
>> Angeline
>>
>>
> --
> Michael
> http://www.dewey.myzen.co.uk/home.html
>



-- 
Best Regards,
Angeline

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