The Inverse-Weibull proves useful for modelling the childhood and teenage years, because the logarithm of h(x) is a concave function. m > 0 is a measure of location sigma > 0 is measure of dispersion
invweibull(x, par = NULL)
vector of age at the beginning of the age classes
parameters of the selected model. If NULL the default values will be assigned automatically.
invweibull(x = 1:20)
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