ABSTRACT
This chapter introduces price series and rates of return of several assets, that is, sets of assets. The price series from a single stock is a single time series; prices from several stocks constitute a multiple time series. Stock closing prices are recorded at the end of successive time periods. The time period could be days, weeks, months, quarters, or years. The chapter provides an example by considering two stocks, A and B. The probability that the rate of return (ROR) will be negative, the loss probability, is computed next for Stock A and Stock B. The chapter describes about the January effect. This effect is the tendency of security prices to tend to increase in January.
