Figure 1From: The choice of statistical methods for comparisons of dosimetric data in radiotherapyDensity plots showing the deviation of normality and the positive skewness (i.e., clustering at the lower end (left) of the scale). Negative skewness would have shown clustering at the higher end of the scale. A normal curve using the mean and standard deviation of the data as parameters has been drawn on top of the histograms to show the deviation of normality.Back to article page