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What Is Momentum? — The Case for "Winners Keep Winning"
Conventional wisdom usually says "buy low, sell high." Yet one of the most stubbornly persistent quantitative strategies of the past several decades stands on t
What Is a Moving Average? The Truth About the Golden Cross
There's a trade signal you'll hear again and again on stock channels and charting tutorials. "A golden cross just printed — buy now." The golden cross is a sign
What Are Bollinger Bands? What Happens When the Band Narrows
Turn Bollinger Bands on and you get two lines wrapped around price, widening and narrowing as the chart moves. And almost everyone learns them the same way. "To
What Is RSI? Is Below 30 a Buy?
If you could put only one indicator on a chart, a lot of people would pick RSI. And almost everyone learns it the same way. "RSI under 30 means oversold. That m
What Is a Backtest? Testing a Strategy on the Past, Before You Fund It
A backtest fits in one sentence. Apply your trading rules to the entire history of past data, and count what would have happened if you had taken every single t
The Chart Pattern That Looked Perfect — Until I Counted All 837
Look at enough charts and certain patterns jump right out at you. Price sits pinned in a narrow range, then snaps upward, holds above, and the moving averages t
Is a Low P/E Really a Cheap Stock? The Truth About Low P/E
Study investing for a week and the first metric you meet is the P/E ratio. It's also the first one you'll misread. "P/E is low? Cheap stock. Buy it." That singl
What Is Quant Investing? Trading on Numbers, Not Gut Feeling
"I've got a good feeling about this stock." Anyone who has ever bought a stock knows this feeling. The chart looks good, there's news, someone said it's a winne
Welcome to QuantLog
An investing blog that unpacks quant strategies, indicators, and backtests with numbers.