Time Series Momentum and Cross Sectional Momentum
Time series momentum: A comparison to a security’s own past return predicts its future return. For example, the rate of change over the past 6 months vs. the past month.
Cross-sectional momentum: A comparison to a security’s outperformance relative to peers predicts future relative outperformance. For example, the rate of change of a stock vs. its sector index.
A great paper on this is found at: Time Series Momentum: A Trending Walk Down Wall Street.
