Which function would you use to graph historical price spread and ratio?

The function that is used to graph historical price spread and ratio is the Historical Spread function, which is indicated by the abbreviation HS. This function allows users to analyze the price differences between two or more related securities over a specified period, providing insights into market trends, relative pricing, and volatility.

Using HS enables traders and analysts to visualize how the spread between these prices has changed over time, offering important information for decision-making. It can also provide context for assessing whether the current spread is within a historical range or if it might indicate a trading opportunity based on historical performance.

The other functions listed do not specifically cater to historical price spread and ratio analysis, which is why HS is the most appropriate choice for this particular question.