Maintains database, does back testing and reporting. The program watches the ratio of two stocks and when that ratio gets too low or too high, it generates a signal to buy or sell the ratio short. A ratio that is too low or too high it implies a comparison to a normal value. Program uses a digital low pass electric filter to determine a normal ratio.
The filter attenuates spikes but passes ratio changes that occur slowly. The normal level cannot be affected by sudden spikes but will follow slow moving ratio changes. The normal ratio will follow with some delay jumps that remain high or low. This version is the first release on CNET Download.com.