Fundamental data is company- and economy-related information derived from financial reports and other measures of underlying financial condition. In quantitative trading, it is one of three broad data categories, alongside market data and alternative data. Each can provide predictive signals. section 10.2.1
Treat fundamental data as a candidate data source, not an automatic trading signal. Data categories have distinct structural challenges, biases, and engineering pitfalls, so assess a source before investing in a strategy built on it. Adjusted prices and survivorship bias illustrate pitfalls in market data; they are not examples of fundamental data. section 10.2.1

