Box-whisker charts come in many varieties, with the whiskers representing different statistical values: 9th and 91st percentile, 2nd and 98th percentile, 1 standard deviation above/below the mean, etc. 

Unfortunately, I can't find in the documentation any definition of what statistical value the whiskers represent in Nevron Chart box-whisker plots.  Could someone please provide me with such a definition?

Many thanks,

           Dan Reaume

 

Hello Dan,

The Box and Whiskers data point values are not bound to any specific statistical value. You can perform your own statistical calculations and use the Box and Whiskers series to display the results.

The only place where the chart performs statistical calculations for the Box and Whiskers series is the NBoxAndWhiskersDataPoint type, more specifically in the following constructor:

public NBoxAndWhiskersDataPoint(NDataSeries data, bool calculateAverage, bool calculateOutliers)

If the calculateOutliers parameter is set to false – the whiskers will display the full range (min-max) of the data.

If calculateOutliers is set to true – the whiskers will display the value range of the non-outlier values. The non-outlier values are the ones that fall within the outlier boundaries. The outlier boundaries are calculated as follows:

UpperOutlierBoundary = Q3 + IQR * 1.5
LowerOutlierBoundary = Q1 - IQR * 1.5

, where Q1 is the lower quartile, Q3 is the upper quartile, IQR is the interquartile range.

Best Regards,
Milen