`scipy.stats._continuous_distns:dgamma_gen`

Signature

class dgamma_gen(momtype = 1, a = None, b = None, xtol = 1e-14, badvalue = None, name = None, longname = None, shapes = None, seed = None)

A double gamma continuous random variable.

The double gamma distribution is also known as the reflected gamma distribution ^[1].

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The probability density function for dgamma is:

f (x, a) = \frac{1}{2Γ ( a )} ∣ x ∣^{a - 1} exp (- ∣ x ∣)

for a real number $x$ and $a > 0$ . $Γ$ is the gamma function (scipy.special.gamma).

dgamma takes a as a shape parameter for $a$ .

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