If δ_{1} is set to δ_{2} − 1, Equation (29.1) reverts to the Weibull‐II distribution, as shown by the coloured line in Figure 29.1. Varying δ_{1} has an effect similar to that of δ_{2}. However, together they make the distribution a little more flexible.

Fitting to the C_{4} in propane data, in this case, requires that F(x_{n}) is forced to 1; otherwise the fit in this area is very poor. Doing so sets β, δ_{1} and δ_{2} to 1.01, 2.954 and 0.948 respectively. With RSS at 0.0779 the fit is poor compared to several alternative distributions.

29.2 Q‐Weibull

Employing a method similar to that used to develop the q‐Gaussian distribution from the normal distribution, the q‐Weibull distribution is developed from the Weibull distribution. It is another in the family of Tsallis distributions.

If q is set to 1, the distribution reverts to the ...

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