How Well Street worksEvidence is only worth what the method behind it is worth. These pages document how Well Street computes what it shows you — plainly, with the limits included.

How Backtesting Works on Well Street — What actually happens when you run a strategy back through market history on Well Street — the simulation, the assumptions, the metrics, and the honest limits.

Point-in-Time Data, Explained — Why honest backtests need data as it looked at the time — how look-ahead bias and survivorship bias inflate results, and how point-in-time data prevents it.

Our Data: Sources, Coverage & How Metrics Are Computed — Where Well Street's market data comes from, what it covers, how often it updates, and how every metric on the platform is defined and computed.

Start with the fundamentals in the free investing concepts library, or look up any metric in the financial glossary.