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. 2012 Nov 8;6(11):e1881. doi: 10.1371/journal.pntd.0001881

Figure 5. Assessment of publication bias with Begg's funnel plot.

Figure 5

The measure of effect is ln(DOR) and the standard error of the ln(DOR) is the measure of variance. Note relative deficit of smaller studies showing lower accuracy in the lower right quadrant of the figure.