Distribution Analysis: Outlier Detection

Plots Tab

You can use the Plots tab (Figure 17.4) to create a histogram and a normal Q-Q plot of the chosen variable.

If you select Overlay normal curve and outlier cutoff, then the histogram includes an overlaid normal curve. (See Figure 17.5.) The parameters for the normal curve are the location and scale estimates of the data. A vertical reference line in the histogram indicates the location estimate, and shading indicates regions more than $c \hat{\sigma }$ units from the location estimate, where c is the scale multiplier and $\hat{\sigma }$ is the scale estimate.