May be of use for the busy investor. Very simple.
-Rebalance yearly for less tax on capital gains and maintenance
-Screen stocks based on:
--top 50% by EBITDA/EV
--top 20% by ROIC
--required liquidity ratios and dollar volumes
-Pick the remaining stocks with the lowest ulcer index
-Allocate using minimum variance optimization
-Switch to long term treasuries and gold when markets decline. Gold to hedge inflation and treasuries to hedge deflation.
Result:
Not much better than timing with the SPY. Perhaps tweak fundamental factors?
Warning:
Backtest does not include slippage and transaction costs.