Investing advice, checked against the data.
Plenty of investing wisdom gets repeated and almost none of it gets tested. I run the numbers on the claims people actually act on — and publish the code, the sample period, and the cases where the answer flips.
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Does Buying the Dip Actually Work? 98 Years of Data
Waiting for a pullback sounds obviously smart. Across 225 rolling 20-year windows of S&P 500 data, waiting for a 5% or 10% dip won exactly zero times.