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)