Figure 6

Relative errors of the sample standard deviation estimation for non-normal data (log-normal, beta, exponential and Weibull), where the black lines with solid circles represent the method under scenario ${\mathcal{C}}_1$ , the red lines with solid triangles represent the method under scenario ${\mathcal{C}}_2$ , and the green lines with empty circles represent the method under scenario ${\mathcal{C}}_3$ .