Primarily internal code for checking optimization convergence, see convergence for a more detailed discussion.
checkConv(derivs, coefs, ctrl, lbound, debug = FALSE)typically the "derivs" attribute of optimizeLmer(); with
"gradients" and possibly "Hessian" component
current coefficient estimates
list of lists, each with action character strings specifying
what should happen when a check triggers, and tol numerical tolerances,
as is the result of lmerControl()$checkConv.
vector of lower bounds for random-effects parameters only (length is taken to determine number of RE parameters)
enable debugging output, useful if some checks are on "ignore", but would "trigger"
A result list containing
The return code for the check
A character vector of warnings and messages generated by the check