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confunnel is a Stata command implementing contour enhanced funnel plots for meta-analysis (Peters et al., 2008). It was distributed in the Stata Journal (Palmer et al., 2008).

To install, issue in Stata (in versions 13 and above):

net install confunnel, from("https://raw.github.com/remlapmot/confunnel-stata/master/")

An official Stata contour enhanced funnel plot command, based onconfunnel is available, since I think Stata version 15, through themeta funnelplot command as follows

meta funnelplot [if] [in], contours(contourspec) [options]

Here is a comparison of the plots that they produce (plots generated under StataNow 18.5)

webuse nsaidsset, clearssc install mylabelsmylabels 0.02 0.2 1 5 50, myscale(log(@)) local(mylab)confunnel _meta_es _meta_se, twowayopts(xtitle("Odds ratios (log scale)")`"xlabel(`mylab')"' title("Contour-enhanced funnel plot"))

meta funnelplot, contours(1 5 10) xtitle("Odds ratios (log scale)") xlabel(`mylab') legend(pos(2) ring(0))

• Palmer, T. M., J. L. Peters, A. J. Sutton, and S. G. Moreno. Contour enhanced funnel plots for meta-analysis. Stata Journal, 2008, 8, 2, 242-254.DOI: 10.1177%2F1536867X0800800206
• Peters, J. L., A. J. Sutton, D. R. Jones, K. R. Abrams, and L. Rushton. Contour-enhanced meta-analysis funnel plots help distinguish publication bias from other causes of asymmetry. Journal of Clinical Epidemiology, 2008, 61, 10, 991-996.DOI: 10.1016/j.jclinepi.2007.11.010