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.