Print out a fit of Aalen's additive regression model
USAGE:
print.aareg(x, maxtime, weight=c("var", "nrisk"))
REQUIRED ARGUMENTS:
x
the result of a call to the aareg function.
OPTIONAL ARGUMENTS:
maxtime
the upper time point to be used in the test for non-zero slope.
weight
the weighting to be used in the test for non-zero slope.
The default weights are based on the variance of each coefficient, as
a function of time. The alternative weight is proportional to the number
of subjects still at risk at each time point.
VALUE:
the calling argument is returned.
SIDE EFFECTS:
the results of the fit are displayed.
DETAILS:
The estimated increments in the coefficient estimates can become quite
unstable near the end of follow-up, due to the small number of observations
still at risk in a data set.
Thus, the test for slope will sometimes be more powerful if this last
'tail' is excluded.
REFERENCES:
Aalen, O. O. (1989).
A linear regression model for the analysis of life times.
Statistics in Medicine8, 907-925.