dggamma(y, m, s, f) pggamma(q, m, s, f) hggamma(y, m, s, f)
y
| vector of responses. |
q
| vector of quantiles. |
m
| vector of location parameters. |
s
| vector of dispersion parameters. |
f
| vector of family parameters. |
m, dispersion equal
to s, and family parameter equal to f.
dggamma gives the density, pggamma gives the distribution
function, hggamma gives the hazard function.
The generalized gamma distribution has density
f(y) = 1/((m/s)^(fs) Gamma(s)) y^(f(s-1)) exp(-(y s/m)^f)
where m is the location parameter of the distribution, s is the dispersion, and f is the family parameter.
f=1 yields a gamma distribution, s=1 a Weibull distribution, and s=infinity a log normal distribution.
dgamma for the gamma distribution,
dweibull for the Weibull distribution, dlnorm
for the log normal distribution.dggamma(2, 5, 4, 2) pggamma(2, 5, 4, 2)