On Normalized P/E Ratios and the Election Cycle (Again)
Today, I’ll be detailing how I calculated the normalized P/E numbers I referenced in two previous posts: “On 15-Year Normalized P/E Ratios for the Dow” and “On Normalized P/E Ratios and the Election Cycle“.
That explanation will come later in the day. First, I’d like to revisit two topics about which I’ve received quite a bit of email over the last twenty-four hours. The two topics readers seem most interested in are the election cycle and the relationship between 15-year normalized price-to-earnings ratios and one-year point growth in the Dow.
First, let’s tackle the election cycle. When writing about this (normalized P/E) project, I run a lot of numbers I never report to you. For the most part, I only share interesting or unexpected findings. However, I still routinely check to make sure I’m not missing something obvious. Despite these checks, I encourage (and ultimately depend on) your attempts to keep me honest by pointing out the possible holes in my logic.
So, let’s poke a bit at the findings from the last post and see if we can find a hole.
The Hypothesis
One obvious explanation for the election cycle effect is that mid-term years might tend be abnormally cheap years. Is this hypothesis supported by the data?
Technically, mid-term years do have below-average 15-year normalized P/E ratios. But, I wouldn’t say these years have abnormal 15-year normalized P/E ratios, because other randomly selected groups from within this same set of years (1935-2005) would also have normalized P/E ratios that fall a bit below the average for the entire set.
The Comparison
The “full set” (1935-2005) had an average (mean) 15-year normalized P/E of 14.08, a median of 13.59, and a range of 6.88 – 30.84. Just under 44% of the years in this set had a normalized P/E of less than 12.50.
The “election cycle set” (1938, 1942, 1946…) had an average 15-year normalized P/E of 13.46, a median of 13.00, and a range of 6.88 – 28.05. Just over 47% of the years in this set had a normalized P/E of less than 12.50.
The 12.50 Rule
The importance of this last check (percentage of years with normalized P/E of less than 12.50) is based purely on logic. Before beginning this study, I felt that when the Dow has a 15-year normalized earnings yield of 8% or more (i.e., a normalized P/E of 12.50 or less) there is a very good chance it is an attractive purchase for long-term investors, because other assets don’t tend to offer long-term returns superior to those expected from an asset priced at 12.5 times its “earnings power”, and sometimes present greater risks (including a loss of purchasing power) than a diversified group of large businesses like the Dow normally does.
Obviously, the fact that, since 1935, the Dow has been (what I would call) “undeniably cheap” nearly 44% of the time helps explain why it has done so much for long-term investors. Stocks are not inherently attractive; …
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