| survreg {survival} | R Documentation |
Regression for a parametric survival model. These are all time-transformed location models, with the most useful case being the accelerated failure models that use a log transformation.
survreg(formula=formula(data), data=parent.frame(), weights, subset,na.action,dist="weibull", init=NULL, scale=0, control=survreg.control(),parms=NULL,model=FALSE, x=FALSE, y=TRUE, robust=FALSE, ...)
formula |
a formula expression as for other regression models.
See the documentation for lm and formula for details.
|
data |
optional data frame in which to interpret the variables occurring in the formula. |
weights |
Optional observation weights |
subset |
subset of the observations to be used in the fit. |
na.action |
function to be used to handle any NAs in the data. |
dist |
assumed distribution for y variable.
If the argument is a character string, then it is assumed to name an element from survreg.distributions. These include
"weibull", "exponential", "gaussian",
"logistic", "lognormal" and "loglogistic". Only
enough of the name needs to be given to make the choice unique.
Otherwise, it is assumed to be a user defined list conforming to the format described in survreg.distributions.
|
parms |
a list of fixed parameters. For the t-distribution for instance this is the degrees of freedom; most of the distributions have no parameters. |
init |
optional vector of initial values for the parameters. |
scale |
optional fixed value for the scale. If set to <=0 then the scale is estimated. |
control |
a list of control values, in the format producted by survreg.control.
|
model |
if TRUE, the model frame is returned. |
x |
if TRUE, then the X matrix is returned. |
y |
if TRUE, then the y vector (or survival times) is returned. |
robust |
if TRUE, sandwich standard errors are computed. Defaults to TRUE when
formula contains a cluster term.
|
... |
other arguments which will be passed to survreg.control.
|
an object of class survreg is returned.
This routine underwent significant changes from survival4 to
survival5. The survreg.old function gives a backwards-compatible
interface. In S-PLUS the new function is called survReg and
the old one survreg.
survreg.object, survreg.distributions,
pspline, frailty, ridge,
survreg.old
## These are all the same survreg(Surv(futime, fustat) ~ ecog.ps + rx, ovarian, dist='weibull',scale=1) survreg(Surv(futime, fustat) ~ ecog.ps + rx, ovarian, dist="exponential") survreg.old(Surv(futime, fustat) ~ ecog.ps + rx, ovarian, dist='extreme',fixed=list(scale=1),link="log")