Further to my post on what factors I use to pick Compound Income stocks and the value stock selection the other day.
I came across a site recently that explains things in a relatively simple fashion including videos, which may be preferable if you find the academic papers a bit heavy going.
This article looks at the benefits of adding a profitability measure to a variety of different portfolios.
While this one which includes videos and looks at market, value and size risk factors. I particularly like the bit where it explains why buying a seemingly boring value stock which makes Spam over a growth stock involved in Mobile Phones might be a good way to go, enjoy.