-written command survci can be used to plot the pointwise intervals for the survivor function after the Cox model. In this article, I … estimators. In the absence of covariates, the official command sts graph can be used to plot these intervals for the survivor … function or the cumulative hazard function; however, in the presence of covariates, sts graph is insufficient. The user …

standard regularity condition is that the survivor function of the distribution be log concave. In an auction where the seller … sets a fixed price, the equivalent condition requires log concavity of a survivor function derived from the primitive … distribution. In this note we show that log concavity of the primitive survivor function implies log concavity in the derived …