Leybourne Newbold and Vougas (1998) nonlinear unit root test function Use LNV_1998_unit_root (NonlinearTSA) With (In) R Software
https://dik.si/LNV_1998_unit_root
Hylleberg-Engle-Granger-Yoo (HEGY) Seasonal unit root test for quarterly data Use hegy4 With STATA 19
https://ln.run/hegy4
#rstudio #rsoftware #softwarer #stata #stata19 #olahdatasemarang