The PERT distribution offers an alternative to using the triangular distribution which takes the same three parameters.
The PERT distribution has a smoother shape than the Triangular distribution.
The triangular distribution has a mean equal to the average of the three parameters:
The formula places equal emphasis on the extreme values which are usually less-well known than the most likely value, and can therefore be unduly influenced by poor estimation of an extreme.
The triangular distribution also has an angular shape that does not match the smoother shape that typifies subjective knowledge:
The PERT distribution offers an alternative to using the triangular distribution which takes the same three parameters. The PERT distribution has a smoother shape than the Triangular distribution. The triangular distribution has a mean equal to the average of the three parameters:
The formula places equal emphasis on the extreme values which are usually less-well known than the most likely value, and can therefore be unduly influenced by poor estimation of an extreme. The triangular distribution also has an angular shape that does not match the smoother shape that typifies subjective knowledge:
PERT distribution