Difference between revisions of "Documentation/How Tos/Calc: WEIBULL function"
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: The Weibull distribution is a continuous probability distribution, with parameters <tt>'''k'''</tt> > 0 (shape) and <tt>'''λ'''</tt> > 0 (scale). | : The Weibull distribution is a continuous probability distribution, with parameters <tt>'''k'''</tt> > 0 (shape) and <tt>'''λ'''</tt> > 0 (scale). | ||
| − | : If mode is <tt>''' | + | : If mode is <tt>'''0'''</tt>, <tt>'''WEIBULL'''</tt> calculates the probability density function of the Weibull distribution: |
::[[Image:Calc_weibull1_equation.png]] | ::[[Image:Calc_weibull1_equation.png]] | ||
| − | : If mode is <tt>''' | + | : If mode is <tt>'''1'''</tt>, <tt>'''WEIBULL'''</tt> calculates the cumulative distribution function of the Weibull distribution: |
::[[Image:Calc_weibull0_equation.png]] | ::[[Image:Calc_weibull0_equation.png]] | ||
Revision as of 17:47, 12 September 2009
WEIBULL
Calculates values for a Weibull distribution.
Syntax:
WEIBULL(x; k; λ; mode)
- The Weibull distribution is a continuous probability distribution, with parameters k > 0 (shape) and λ > 0 (scale).
- If mode is 0, WEIBULL calculates the probability density function of the Weibull distribution:
- If mode is 1, WEIBULL calculates the cumulative distribution function of the Weibull distribution:
Example:
WEIBULL(2.5; 3; 4; 1)
- returns approximately 0.2166, the value of the probability density function with k = 3 and λ = 4 at x = 2.5.
WEIBULL(2.5; 3; 4; 0)
- returns approximately 0.2295, the value of the cumulative distribution function with k = 3 and λ = 4 at x = 2.5.
