WeibullCDF

 

Function[edit]

y=\begin{cases} y_0+A_1\int_{0}^{x}ba^{-b}t^{b-1}e^{-\left (\frac{t}{a}\right)^b}dt=y_0+A_1\left ( 1- e^{-\left (\frac{x}{a}\right)^b}\right )&x>0\\ y_0 & x\leq 0 \end{cases}

Brief Description[edit]

Weibull cumulative distribution function

Sample Curve[edit]

Weibull cumulative.png

Parameters[edit]

Number: 4

Names: y0, A1, a, b

Meanings: y0 = offset, A1 = Amplitude, a = Scale, b = Shape

Lower Bounds: A1 > 0.0, a > 0.0, b> 0.0

Upper Bounds: none

Derived Parameters[edit]

Mean: mu=a*gamma(1+1/b)

Standard Deviation: sigma=a*sqrt( gamma(1+2/b)-(gamma(1+1/b))^2 )

Script Access[edit]

 wblcdf(x, a, b)

Function File[edit]

FITFUNC\WeibullCDF.fdf

Category[edit]

Statistics
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