"robust2sls" objectupdate_list takes an existing "robust2sls" object and appends
the estimation results (ivreg model object, residuals,
standardised residuals, selection and type vectors) of a new iteration.
update_list(current_list, new_info, name)An object of class "robust2sls" whose components
$model, $res, $stdres, $sel, and $type are
now appended with the new iteration results.
A list object of class "robust2sls".
A list with named components $model, $res,
$stdres, $sel, and $type.
A character vector of length one naming the appended iteration
results. Convention is "m0", "m1", "m2" etc. for
iterations 0 (initial), 1, 3...