Hello Michael,Thank you very much for your reply. Yes, I did jitter the effect size or variance before running rma. But I did not find difference of the funnel plot plotted using this method. I am sorry but I really have a question about jittering the points in the function of "funnel plot". I tried to go through the arguments and I really do not know where I can put the jitter function in the code. I can't jitter the regression model itself (as it is an object) and I can't jitter other arguments as well because the other arguments are related to the graph itself, for example y-axis and x-axis. I would very much appreciate it if you can give me more tips here. I am a beginner of R (only knowing how to run several analyses in R, so my knowledge of creating a function in R is very limited).Thanks,AngelineOn Fri, Jul 20, 2018 at 3:56 AM, Michael Dewey <