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Double Weibull Distribution

This is a signed form of the Weibull distribution.

f(x;c)=c2|x|c1exp(|x|c)F(x;c)={12exp(|x|c)x0112exp(|x|c)x>0G(q;c)={log1/c(12q)q12log1/c(12q1)q>12
μn=μn={Γ(1+nc)neven0nodd
md=μ=0μ2=Γ(c+2c)γ1=0γ2=Γ(1+4c)Γ2(1+2c)md=NAbimodal

Implementation: scipy.stats.dweibull