Computation Method
- Quartiles are calculated using linear interpolation (method 7 from Hyndman & Fan, 1996), consistent with Python's NumPy and pandas defaults.
- Outlier detection uses the Tukey fences method: lower fence = Q1 − 1.5 × IQR, upper fence = Q3 + 1.5 × IQR.
- Chart scaling caps the display axis at the upper fence value so the visualization remains clear even when extreme outliers are present.
References
- Hyndman, R. J. & Fan, Y. (1996). "Sample Quantiles in Statistical Packages." The American Statistician, 50(4), 361–365.
- Tukey, J. W. (1977). Exploratory Data Analysis. Addison-Wesley.