5.2. Additional tests
We further repeat conditional analysis for sub-samples based on several variables: issue-specific attributes like equity volatility, bond liquidity and industry, and overall market conditions such as time-period, VIX, and aggregate bond market liquidity. We form two portfolios based on the annual median values of each underlying variable or, based on industry, classify bonds into Financials vs. Industrials and Utilities, and then conduct cross-sectional regressions for each sub-sample. Table 8 tabulates the results. Columns 6 and 7, Table 8, reveal that, in absolute terms, effects of both volatility and liquidity shocks are more prominent for high-volatility bonds; however columns 8 and 9 indicate that, on a relative basis, volatility shocks matter more for high-volatility issues, while liquidity shocks are more evident for low-volatility issues. In terms of their relative contribution to the overall explan- atory power, as columns 4 and 5 show, there is a similar segmentation in volatility and liquidity effects.