The beginning forecaster : the forecasting process through data analysis / Hans Levenbach, James P. Cleary Levenbach, Hans Cleary, James P. jt. aut. Forecasting Forecasting Statistical 303.4 LEB Includes index. Bibliography : p. 361-365 Belmont : Lifetime Learnig, 1981 1981 Text xi, 371 p. : eng