Piotroski F-Score, Last Year

What is the definition of Piotroski F-Score, Last Year?

Stockopedia explains Piotroski F-Score, Last Year...

Piotroski showed that stocks scoring 8 or 9 significantly outperformed stocks scoring 1 or 2. It is a good shorthand for deeper financial analysis and more recent studies have shown that focusing on high F-Score stocks can reduce the volatility of returns in a value portfolio.