This function replaces the robustification value for length composition data
in a .dat
file that was read in using SS_readdat
with those specified in
lcomp_constant
. It then writes a new file with name outfile
into the working directory. If used with run_ss3sim
the case
file should be named lcomp_constant
. A suggested case letter is
C
.
change_lcomp_constant(lcomp_constant, dat_list, outfile = NULL)
A modified SS3 .dat
file, and that file returned invisibly
(for testing) as a vector of character lines.
All function argument descriptions that start with an asterisk (*) will be passed
through the case files to run_ss3sim
. If one of these arguments
is not specified in a case file, then a value of NULL
will be passed,
which may or may not be an appropriate value. Other arguments will be ignored
if specified.
The robustification constant is added to both the observed and expected proportions of length composition data, before being normalized internally. It is designed to help stabilize the model, but is unclear how and when to use it for optimal effect. The same value is used for all length data.