Beta Distribution

Beta Statistical Distribution


General Characteristics

  • The Beta distribution curve can take a variety of shapes; asymmetrical shapes, symmetrical half circle and/or inverted or cup-up half circle.


Specific Characteristics

Key Measures:

Shape1 (S1), Shape2 (S2)


Range of values:

0 < x < 1



Mean = (Shape1) / (Shape1 + Shape2)
Mean = S1 / (S1 + S2)


Standard Deviation, SD:

SD = √[(S1 * S2) / ((S1 + S2)² * (S1 + S2 + 1))]



Beta distributions can be used; to calculate the time required to complete a task & as an approximation in the absence of data.





Beta Statistical Distribution – Statistical Distributions
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