A Study, from Kim Zussman
Looking at SPY reversal patterns (2007-present): If two consecutive trading days were each up >1%, and they were preceded by a drop of at least 1%, the next 2-day return was negative (NS):
One-Sample T: DUUXX
Test of mu = 0 vs not = 0
Variable N Mean StDev SE Mean 95% CI T
DUUXX 18 -0.0097 0.025 0.0058 (-0.022, 0.002) -1.64
Variable P
DUUXX 0.119