Model selection

ref: ca116

ref: ca117

ref: ca117

ref: ca118

ref: ca118

ref: ca119

ref: ca119

ref: ca120

ref: ca120

ref: ca121

ref: ca121

ref: ca122

ref: ca122

ref: ca123

ref: ca123

ref: ca124

ref: ca124

ref: ca125

ref: ca125

ref: ca126

ref: ca126

ref: ca127

ref: ca127

ref: ca128

ref: ca128

ref: ca129

ref: ca129

ref: ca130

ref: ca130

ref: ca131