[R] The l1ce function in lasso2: The bound and absolute.t parameters.

[Søren Højsgaard]

Dear all,
 
I am quite puzzled about the bound and absolute.t arguments to the l1ce function in the lasso2 package. (The l1ce function estimates the regression parameter b in a regression model y=Xb+e subject to the constraint that |b|<t for some value t).
 
The doc says:
bound	 numeric, either a single number or a vector: the constraint(s) that is/are put onto the L1 norm of the parameters.	
absolute.t	 logical flag: if TRUE, then bound is an absolute bound and all entries in bound can be any positive number. If FALSE, then bound is a relative bound and all entries must be between 0 and 1.	
 
Default is that bound=0.5 and absolute.t is FALSE. Hence the bound is relative to "something", but I can't figure out what this "something" is (and it is not clear from the papers listed in the man pages either). Can anyone help on this??
 
Thanks
Søren