It is only over the last 10 years that the monthly returns for the lowest
BM decile have been negative.
The third observation is that the low
BM decile — Decile 1 — has for most of the time had a positive monthly return.
«Low BM» is the lowest
BM decile, marked in red.
The green «HML» line is -30 % of the return on the low
BM decile and 130 % the return on the high
BM decile.
In this chart the green «HML» line is -100 % of the return on the low
BM decile and 100 % the return on the high
BM decile:
«High BM» is the highest
BM decile, marked in blue.
First, the relationship between high and low
BM deciles is relatively unchanged over time.
Not exact matches
Doesn't Piotroski's study always take the top
decile of high
BM firms?
«
Decile 10» is formed from the portfolio of stocks with the highest
BM ratio (lowest P / B), «
Decile 1» is the portfolio of stocks with the lowest
BM ratio (highest P / B) and so on.
The relatively high
BM stocks in
deciles 10, 9, and 8 tend to outperform the relatively lower
BM stocks in
deciles 1, 2, and 3.