python - Boxplots in matplotlib: Markers and outliers -


i have questions boxplots in matplotlib:

question a. markers highlighted below q1, q2, , q3 represent? believe q1 maximum , q3 outliers, q2?

                       enter image description here

question b how matplotlib identify outliers? (i.e. how know not true max , min values?)

a picture worth thousand words. note outliers (the + markers in plot) points outside of wide [(q1-1.5 iqr), (q3+1.5 iqr)] margin below.

    enter image description here

however, picture example distributed data set. important understand matplotlib not estimate normal distribution first , calculates quartiles estimated distribution parameters shown above.

instead, median , quartiles calculated directly data. thus, boxplot may different depending on distribution of data , size of sample, e.g., asymmetric , more or less outliers.


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