Print out a fit of Aalen's additive regression model
# S3 method for aareg
print(x, maxtime, test=c("aalen", "nrisk"),scale=1,...)the calling argument is returned.
the result of a call to the aareg function
the upper time point to be used in the test for non-zero slope
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.
scales the coefficients. For some data sets, the coefficients of the Aalen model will be very small (10-4); this simply multiplies the printed values by a constant, say 1e6, to make the printout easier to read.
for future methods
the results of the fit are displayed.
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.
Aalen, O.O. (1989). A linear regression model for the analysis of life times. Statistics in Medicine, 8:907-925.
aareg