See documentation for summary.rq for complete description
of the options for se.type, conf.int, etc.
process_rq(rq_obj, se.type = "rank", conf.int = TRUE, conf.level = 0.95,
...)an object returned by summary.rq or summary.rqs
type of standard errors used in summary.rq or summary.rqs
whether to include a confidence interval
confidence level for confidence interval
currently unused