backtesting

“Literally, since our Goldman Sachs days, this is more than 25 years ago, we've generally used half a backtest out of sample as a bogey. And life has worked out fairly close to that.”

“When you're running a back test through the better part of the last decade, ChatGPT knows that Nvidia became a multi-trillion dollar company. ChatGPT knows what the mega trends were in the economy and the market over those timeframes. It's not realistic to tru…”