* Reference: Chapter 13 of * Jeffrey M. Wooldridge, Introductory Econometrics: A Modern Approach, * South-Western College Publishing, 2000. SAMPLE 1 1084 READ (CPS78_85.shd) educ south nonwhite female married exper expersq & union lwage age year y85 y85fem y85educ y85union * Example 13.2, pp. 412-413 OLS lwage y85 educ y85educ exper expersq union female y85fem * Chow test for a different equation in each year. * The data set is arranged with all data for 1978, followed by * all data for 1985. OLS lwage educ exper expersq union female * The CHOWONE= option specifies the number of observations in the * first group (in this case, the number of observations in 1978). DIAGNOS / CHOWONE=550 * Now implement separate OLS estimations for each year. * 1978 SAMPLE 1 550 OLS lwage educ exper expersq union female * 1985 SAMPLE 551 1084 OLS lwage educ exper expersq union female STOP