sorts the right-censored data of n individuals to prepare it for hazard regression analysis. The observed data are n triples (t_i,delta_i,z_i): t_i denotes the observed survival time of the i-th individual, delta_i is the censoring indicator, z_i denotes the p-dimensional covariate vector associate
2-step estimation of a regression equation in the presence of self-selection. Selection rule is of the probit type (hence, this is a Type 2 Tobit Model in chapter 10 of Amemiya's Advanced Econometrics).
Test procedure proposed by Hylleberg, Engle, Granger, Yoo (HEGY) for seasonal unit roots in quarterly time series. Deterministic components (constant, seasonal dummies and trend) can be included. The procedure renders a table with estimated coefficients and non-standard critical values given by HEG