No. of Recommendations: 6
TGMark wrote:
"It was difficult to compare to GTR1 since current data is not available in GTR1." I recently signed up for the P123 trial plan, and am running through my evaluation steps. I expect P123 will pass all of my tests, but could post details if people are interested. Let me know.
For comparison between GTR1 and P123, I plan on looking at the correlation of monthly excess returns (monthly return minus benchmark return). I will also compare CAGR across multiple screens. I expect P123 and GTR1 to match close enough for my purposes.
TGMark wrote:
Do folks find that subscribing to the 20 year backtest level is useful? I need at least a 10-year backtest for my WWL system, and 20 years for new screens. But, maybe AI will change that.
How Far Back Should You Backtest?, February 15, 2025
"The result confirmed what I’d been testing for the last eight years or so: if you’re choosing between a backtest period of three to fifteen years, a nine-to-twelve-year lookback is optimal. ... The lookback periods after fifteen years begin to show increasing correlation, until you reach 24 years, at which point the correlations exceed those of the nine-to-twelve-year lookback."
https://blog.portfolio123.com/how-far-back-should-... 