print.aareg: Print an aareg object
Description
Print out a fit of Aalen's additive regression modelUsage
## S3 method for class 'aareg':
print(x, maxtime, test=c("aalen", "nrisk"),scale=1,...)Arguments
x
the result of a call to the aareg function
maxtime
the upper time point to be used in the test for non-zero slope
test
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.
scale
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.
Value
- the calling argument is returned.
Side Effects
the results of the fit are displayed.References
Aalen, O.O. (1989). A linear regression model for the analysis of life times.
Statistics in Medicine, 8:907-925.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.