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42 lines
1.6 KiB
Text
42 lines
1.6 KiB
Text
The ti(weibull_distribution<RealType = double>) is commonly used in
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reliability engineering and in survival (life data) analysis.
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It has two or three parameters and the two-parameter variant is offered by the
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STL. The three parameter variant has a shape (or slope) parameter, a scale
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parameter and a location parameter. The two parameter variant implicitly uses
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the location parameter value 0. In the two parameter variant the shape
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parameter (a) and the scale parameter (b) are provided. See
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tlurl(http://www.weibull.com/hotwire/issue14/relbasics14.htm) for an
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interesting coverage of the meaning of the Weibull distribution's parameters.
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Defined types:
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verb(
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typedef RealType result_type;
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struct param_type
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{
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explicit param_type(RealType a = RealType(1),
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RealType b = RealType(1));
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RealType a() const; // the shape (slope) parameter
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RealType b() const; // the scale parameter
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};
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)
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Constructors and members:
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itemization(
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itt(weibull_distribution<>(RealType a = 1, RealType b = 1))
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constructs a weibull distribution with specified tt(a) and tt(b)
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parameters;
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itt(weibull_distribution<>(param_type const ¶m))
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constructs a weibull distribution according to the values stored in
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the tt(param) struct.
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itt(IntType a() const)nl()
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returns the distribution's shape (or slope) parameter;
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itt(IntType stddev() const)nl()
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returns the distribution's scale parameter;
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itt(result_type min() const)nl()
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returns 0;
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itt(result_type max() const)nl()
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returns the maximum value of tt(result_type);
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)
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