control.presmooth {survPresmooth}

Control Values for the presmooth() Function

Description

This function returns a list of values for control parameters of the presmooth function.

Usage

control.presmooth(n.boot = c(5000, 1000), q.weight = c(0.2, 0.8),
   k = 1, length.grid.bw.plugin = 100, length.grid.ise = 100,
   pilot.par.ini = NULL, save.data = FALSE, save.mise = FALSE,
   na.action = na.omit)

Arguments

n.boot

A numeric vector of length 2 or, alternatively, a numeric value specifying the number of bootstrap resamples used in bootstrap bandwidth selection. If a vector, the first element is used for S and H estimation, and the second for f and h. The default is c(5000, 1000).

q.weight

A numeric vector of length 2 specifying the order of quantiles of the observed times that determine the left- and right-ends of the support of the weight function. The default is c(0.2, 0.8).

k

A numeric value specifying the multiple of the data range used as the maximum possible value for the selected plug-in or bootstrap bandwidth. The default is 1.

length.grid.bw.plugin

An integer specifying the number of points of the grid used for numerical integration (Simpson's rule) of integrals involved in plug-in bandwidth selection. The default is 100.

length.grid.ise

An integer specifying the number of points of the grid used for computing the integrated squared error by numerical integration (Simpson's rule) in bootstrap bandwidth selection. The default is 100.

pilot.par.ini

A numeric vector of length 8 specifying the initial values of optimization routines used for pilot bandwidth computation in plug-in and bootstrap bandwidth selection (although, in the last case, it is not needed for survival and cumulative hazard function estimation). If NULL, the default, values are internally computed.

save.data

A logical value specifying if the data must be saved as a component of the value returned by the presmooth function. The default is FALSE.

save.mise

A logical value specifying if the MISE computed for bootstrap bandwidth selection must be saved as a component of the value returned by the presmooth function. The default is FALSE.

na.action

A function specifying how to handle missing values. The default value, na.omit, deletes the rows containing missing values in the (internal) data frame formed by the times and status arguments of the call to the presmooth function.

Details

The default values of n.boot represent a trade-off between computational speed and precision in bootstrap bandwidth selection. If enough computing power or time are available, it is recommended to increase the number of bootstrap resamples up to 10000 (which could be very slow for hazard and density estimation).

The six first values of pilot.par.ini are three pairs of parameters specifying three Weibull distributions (in each pair, the first element is the shape parameter; the second one, the scale parameter). These three Weibull distributions form a mixture, the weights of its first two components being given by the last two values of pilot.par.ini.

Value

A list whose components are the arguments of the function, its defaults being replaced with the values the function was called with.

Author(s)

Ignacio Lopez-de-Ullibarri [aut, cre], Maria Amalia Jacome [aut]

See Also

presmooth