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/G", "n/G2", "I"), cluster, influence =0,
ranks = FALSE, reverse = FALSE, timefix = TRUE, keepstrata=10,
robustse = 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.
comput the robust standard error
Terry Therneau
concordance