d STB-7 May 1992 t .. Other STBs p dm7 Utility to reverse variable coding p dm8 Command to unblock data sets p dm9 An ANOVA blocking utility p os4 Stata icon for Microsoft Windows 3.1 p sbe5 Calculating person-years and incidence rates p sbe6 3x3 matched case-control tests p sed7 Resistant smoothing using Stata p sg1_2 Nonlinear regression command p sqv3 Wald and Atkinson's R extensions to logistic p sts2 Using Stata for time series analysis p tt4 Teaching ecology with Stata p tt5 Simple chemical equilibrium