For Defensive grade stocks, Benjamin Graham's framework required at least a 33% increase in Earnings Per Share over the past decade using 3-year averages.
The Earnings Growth rating on Serenity is based on the following Graham rule:
5. A minimum increase of at least one-third in per-share earnings in the past ten years using three-year averages at the beginning and end.
The rating can be interpreted thus:
A value of 100% indicates 33% growth, or Earnings 1.33 times that of 10 years ago. A value of 200% indicates 66% growth or Earnings now 1.66 times, and so on. The years used for calculating the averages are years 0, 1, 2 and years 9, 10, 11 previous to the last fiscal.
Note: Since the upper limit of the result of such a calculation is theoretically infinite, this rating is capped at 1,000,000.00%.
The Earnings Growth rating is expressed as a percentage of Graham's requirement — rather than the percentage of growth itself — for the sake of uniformity. A stock is considered fully Defensive when all its Graham Ratings are 100%.
Given below is a sample Earnings Growth rating calculation, using three years of EPS values each at the beginning and end of the period:
($13.97 - $5.14) ÷ $5.14 = 1.72 (172% growth)
Earnings Growth = 1.72 ÷ 0.33 = 5.2058 = 520.58% (of the growth rate Graham required)