This chapter uses the concept of lower and upper bounds of a real-valued
variable to model daily low and high values of a stock market index. A trader would
like to buy a stock at the lowest value of the day and sell at the highest possible value.
The conservative traders will look for low and high values that are guaranteed within
a tolerance. The aggressive traders may want to know how low and high can a stock
go in a day to formulate their trading strategies. The dual rough support vector
modeling described in this chapter can cater to both conservative and aggressive
traders.