The Technology sector has the best prospect in the 16 to 21 day period. The estimated best ETF in that sector for the mentioned period is $TECL. Next is followed by the Health Care sector with a better than average forecast for the same period. The estimated best ETF in this sector for that period is $XHS.
On the sell side, the Energy sector has the worst outlook in the 1 to 6 day period; in this sector, $AMLP may have the worst results.