sales.def year p s OBS: 36 year = year p = U.S. corporate profits in billions of dollars s = U.S. corporate sales in billions of dollars Data source: The data are taken from Ramanathan (1989) and originate from the 1987 Economic Report of the President. Variable | Obs Mean Std. Dev. Min Max -------------+-------------------------------------------------------- year | 36 1967.5 10.53565 1950 1985 p | 36 41.38333 31.05387 10.7 107.6 s | 36 881.5444 689.9966 181.9 2335