Thanks a lot. In many papers, they reported the changes and 95% ci in the interquartile range, how can I obtain such figure using gam? Thanks! -- View this message in context: http://r.789695.n4.nabble.com/mgcv-beta-coefficient-and-95-CI-tp3320491p3320922.html Sent from the R help mailing list archive at Nabble.com.