* Reference: Chapter 13 of * Jeffrey M. Wooldridge, Introductory Econometrics: A Modern Approach, * South-Western College Publishing, 2000. SAMPLE 1 51 * The state code is a character variable. Therefore, a FORMAT * command is used to load the data. FORMAT(3X,A8,4F10.0,2F11.0,2F10.0) READ (TRAFFIC1.shd) state admn90 admn85 open90 open85 dthrte90 & dthrte85 speed90 speed85 / FORMAT * Calculate the average death rates in 1985 and 1990 STAT dthrte85 dthrte90 * Example 13.7 * Differencing across the 2 years. GENR cdthrte = dthrte90 - dthrte85 GENR copen = open90 - open85 GENR cadmn = admn90 - admn85 * Apply the First-Differenced Estimator - Equation (13.27), p. 428. OLS cdthrte copen cadmn STOP