Chapter 2: Main Application  87
u invTCDf [Action][Distribution/Inv.Dist][Inverse][invTCDf]
Function: Returns the lower bound value of a Student’s t cumulative distribution probability for specified
values.
Syntax: invTCDf(
prob, df [ ) ]
Calculation Result Output:
xInv
Example: To determine the lower bound value when
prob = 0.0754752,
df = 18
u chiPDf [Action][Distribution/Inv.Dist][Continuous][chiPDf]
Function: Returns the χ
2
probability density for specified values.
Syntax: chiPDf(
x, df [ ) ]
Calculation Result Output:
prob
Example: To determine the χ
2
probability density when x = 2, df = 4
u chiCDf [Action][Distribution/Inv.Dist][Continuous][chiCDf]
Function: Returns the cumulative probability of a χ
2
distribution between a lower bound and an upper bound.
Syntax: chiCDf(lower value, upper value,
df [ ) ]
Calculation Result Output:
prob
Example: To determine the χ
2
probability when lower value = 2.7,
upper value = ∞, df = 4
u invChiCDf [Action][Distribution/Inv.Dist][Inverse][invChiCDf]
Function: Returns the lower bound value of a χ
2
cumulative distribution probability for specified values.
Syntax: invChiCDf(
prob, df [ ) ]
Calculation Result Output:
xInv
Example: To determine the lower bound value when prob = 0.6092146, df = 4
u fPDf [Action][Distribution/Inv.Dist][Continuous][fPDf]
Function: Returns the F probability density for a specified value.
Syntax: fPDf(
x , n : df , d : df [ ) ]
Calculation Result Output:
prob
Example: To determine the F probability density when x = 1.5, n : df = 24,
d : df = 19
u fCDf [Action][Distribution/Inv.Dist][Continuous][fCDf]
Function: Returns the cumulative probability of an F distribution between a lower bound and an upper bound.
Syntax: fCDf(lower value, upper value,
n : df , d : df [ ) ]
Calculation Result Output: prob
Example: To determine the F distribution probability when lower value = 1.5,
upper value = ∞, n : df = 24, d : df = 19
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