This is the working routine behind the concordance function. It
is not meant to be called by users, but is available for other packages
to use. Input arguments, for instance, are assumed to all be the
correct length and type, and missing values are not allowed: the calling
routine is responsible for these things.
concordancefit(y, x, strata, weights, ymin = NULL, ymax = NULL,
timewt = c("n", "S", "S/G", "n/G2", "I"), cluster, influence =0,
ranks = FALSE, reverse = FALSE, timefix = TRUE, keepstrata=10,
std.err = TRUE)a list containing the results
the response. It can be numeric, factor, or a Surv object
the predictor, a numeric vector
optional numeric vector that stratifies the data
options vector of case weights
restrict the comparison to response values in this range
the time weighting to be used
see the help for the
concordance function
either TRUE, FALSE, or an integer value.
Computations are always done within stratum, then added. If the
total number of strata greater than keepstrata, or
keepstrata=FALSE, those subtotals are not kept in the output.
compute the standard error; not doing so saves some compute time.
Terry Therneau
This function is provided for those who want a ``direct'' call to the concordance calculations, without using the formula interface. A primary use has been other packages. The routine does minimal checking of its input arguments, under the assumption that this has already been taken care of by the calling routine.
concordance