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. Author manuscript; available in PMC: 2012 Nov 1.
Published in final edited form as: Clin Lung Cancer. 2011 Jul 1;12(6):393–401. doi: 10.1016/j.cllc.2011.04.005

Figure 7. Publication Bias Funnel Plot for ERCC1 Expression and Overall Survival Random Effects Pooled Analysis.

Figure 7

This figure demonstrates evidence of publication bias based on its lack of studies in its lower left quadrant, where we would expect to find studies with smaller effect sizes and greater levels of variability.