Which function is used to display historical spread analysis?

The function used to display historical spread analysis is indeed HSA. This function stands for Historical Spread Analysis and is specifically designed to help users analyze the historical performance of various spreads, such as credit spreads or interest rate spreads, over time. By utilizing HSA, users can visualize trends, patterns, and changes in spreads based on historical data, making it a valuable tool for traders, analysts, and portfolio managers looking to assess risk and make informed decisions.

The other options do not serve the specific purpose of displaying historical spread analysis. For example, while YCRV might relate to yield curve analysis, it does not focus on spreads specifically. Similarly, RVS and CBS have their own functions within Bloomberg, but they are not geared towards the analysis of historical spreads. Thus, HSA is the appropriate choice for anyone looking to examine the historical dynamics of spreads comprehensively.