This is based on T-Theory concepts of Terry Laundry, who discovered these Rate T's back in 1970's (I think) and used this concept quite successfully for many years. Generally it states that a period of time it takes for interest Rates to fall from high to low is approximately equal to period of time from interest Rate low to important low in Stocks.
He acknowledged difficulties with accuracy of these projections since rates went into historic downtrend in 1980's and also during times of heavy intervention.
1st High to 1st Low in Rate = 1st Bottom in Stocks (in 2015)
Highest High to Panic Low in Rate = 1st Bottom in Stocks (in 2015)
Last High to Lowest Low in Rate = Final Lowest Low in Stocks (in 2016)