I thought I heard my ears burning. All historical data is relevant within the context its used in, there are different trends during different decades, bull/bear markets, indexes and shifts in money flow. Many of these subtle differences are outlined in the Stock Trader's Almanac, I don't think we can call the data bad but we can say it can be interpreted badly. This is the reason I post data as recently as the last 10 occurrences, 20 years, and 50 years. When using seasonal data it's more important to look at the forest, not the trees, it is but one of many tools I use. Sometimes seasonal data flows with the grain, sometimes against it, the trick is be able to distinguish and accept the difference.
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