<p><b>Copyright information:</b></p><p>Taken from "The impact of disease-related impairments on disability and health-related quality of life: a systematic review"</p><p>http://www.biomedcentral.com/1471-2288/7/24</p><p>BMC Medical Research Methodology 2007;7():24-24.</p><p>Published online 19 Jun 2007</p><p>PMCID:PMC1914351.</p><p></p>the standard normal distribution (X as) while the other is the distribution one wishes to compare it against (here the Y as is defined as ES()/√). The deviations from linearity indicate deviations in normality. Publication bias will tend to leave strange gaps in the plot or lead to strange curves
