A Recent 20 Day Advance Decline Thrust Over 50 for 63 Consecutive Days

S&P500 20 Day Advance Decline Thrust Over 50 for 63 Consecutive Days.

On date 20160517 the 20 day advance decline thrust (ADT20) dropped below 50 for the first time in 63 days, a rare condition with only 6 occurrences since 1965, the last being in 2011 (See Results Below). To widen the data slightly I searched the database for when ADT20 was over 50 for 40+ consecutive days. The results are showing a solid edge of being up 70 to 90% of the time on shorter and longer time periods:

Methodology: 
Study 1:
Days in sample: 13510
ADT20 <50 when previous 63+ days >50
Number of occurrences since 1965: 6

Study 2:
ADT20 <50 when previous 40+ days >50
Number of occurrences since 1965: 31

Study 2: ADT20  <50 When Previous 40+ days  >50

Study 1: Rare Occurrence: ADT20 >50 for 63+ consecutive days