Best TSP Allocation

So you want to invest in the TSP I fund

The TSP I fund following the Bellwether timing from July 4th 1998 to June 2018 (21 years) had an annualized return of 10.15% if it switched to the TSP G fund for the unfavorable season. Compare this to the TSP I fund Buy and Hold return over the same time period of only 4.77% annualized.