Piotroski's Simple Accounting Screen for Value Stocks

係"Bull Eye"本書入面，有介紹幾個screening 既方法，其中一個係 "Piotroski's Simple Accounting Screen":

1. Return on Assets (ROA) >0
2. Cash flow from operations >0
3. Change in ROA>0
4. CFO>ROA
5. Change in long term debt<0>0
7. Equity offering if firm didn't issue equity in the preceding 12 months
8. Change in gross margin>0
9. Chang in assets turnover>0