Boxplot
Posted: Tue Mar 15, 2005 12:06 pm
I am using TeeChart 6 to produce a boxplot with the data values
40, 60 ,65, 65, 70, 70, 75, 75, 90, 95
It correctly displays the box from 65 to 75, with a whisker going down to 40. Also 95 is displayed correctly as an outlier. But there is no upper whisker up to 90, nor is 90 displayed as an outlier. If I change 90 to 89.99, the whisker is displayed; if I change it to 90.01 an outlier is displayed.
Since 90 is exactly on the borderline of the upper whisker, it looks as if it is not testing for equality when checking whether the value should be an outlier or not. Logically the value 90 should be displayed as the end of the whisker, and not as an outlier. But either would be better than nothing at all.
40, 60 ,65, 65, 70, 70, 75, 75, 90, 95
It correctly displays the box from 65 to 75, with a whisker going down to 40. Also 95 is displayed correctly as an outlier. But there is no upper whisker up to 90, nor is 90 displayed as an outlier. If I change 90 to 89.99, the whisker is displayed; if I change it to 90.01 an outlier is displayed.
Since 90 is exactly on the borderline of the upper whisker, it looks as if it is not testing for equality when checking whether the value should be an outlier or not. Logically the value 90 should be displayed as the end of the whisker, and not as an outlier. But either would be better than nothing at all.