Draper, N. R., and H. Smith, Applied Regression Analysis (New York: John Wiley and Sons, 1966). Geary, R. C., Relative Efficiency of Count of Sign Changes for Assessing Residual Autoregression in Least Squares Regression, Biometrika 57 (April 1970), 123-127. , Two Exercises in Simple Regression, Economic and Social Review 3 (July 1972), 551-559. Granger, C. W. J., and P. Newbold, Spurious Regressions in Econometrics, Journal of Econometrics 2 (July 1974), 111-120. Johnson, James A., and Ernest H. Oksanen, SocioEconomic Determinants of the Consumption of Alcoholic Beverages, Applied Economics 6 (Dec. 1974), 293-301. Kendall, Maurice G., and Alan Stuart, Advanced Theory of Statistics, vol. 2, second edition (London: Charles Griffin & Company Limited, 1967). Koopmans, Tjalling C., The Bias in Single-Equation Methods of Estimating Behavior Equations Relating to a Small Sector of the Economy, Cowles Commission Discussion Paper, Statistics, no. 336 (dittoed) (Chicago, 1949). Maddala, G. S., The Use of Variance Components Models in Pooling Cross Section and Time Series Data, Econometrica 39 (Mar. 1971), 341-358. Nerlove, Marc, Further Evidence on the Estimation of Dynamic Economic Relations from a Time Series of Cross Sections, Econometrica 39 (Mar. 1971a), 359-382. A Note on Error Components Models, Econometrica 39 (Mar. 1971 b), 383-396.