Statistik › Optionen, Shorts und Positionierung › Gamma and momentum
Intraday momentum in index futures exists only on negative gamma days
Slope of the last-half-hour return on the rest-of-day return for the S&P 500, split on lagged net gamma exposure. t statistics 1.03 and 4.78, adjusted R squared 0.05% and 3.58%. The interaction term is minus 123.04 with a t statistic of minus 3.42. Gamma analysis covers January 1996 to May 2020.
The afternoon of an index futures session follows the morning, with a pooled t statistic of 7.29 over forty-six years. Split the sample on dealer net gamma and the effect is entirely absent when gamma is positive.
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