The Harmonic AnalyzerTM is able to create spread charts that calculate, the difference and the ratio. Many advanced traders know the power of trading spreads. The HA can create any spread chart of anything that the user desires.
Create spread between similar instruments like the S&P500 Spiders (SPY) vs the Dow Jones Industrial Average Diamonds (DIA) SPY~DIA
Create commodity or currency differentials such as Crude futures spread CL_M5~CLZ5 (June vs. December)
Create exotic ETF spreads such as SMH~INTC