Bull Market Correction Or Bear Market?

 | Apr 17, 2018 03:29AM ET

In previous blog posts I explained the limitations of sentiment as a market timing tool. Since the public is invariably wrong at price extremes, it certainly can be helpful to track the public’s sentiment and use it as a contrary indicator.

However, whereas price extremes always coincide with sentiment extremes, sentiment extremes often don’t coincide with price extremes. This is especially the case during long-term bull markets, when sentiment is capable of staying very optimistic for years. It’s therefore best to think of a sentiment extreme as a necessary, but not a sufficient, condition for a price extreme.

With regard to US stock market sentiment there was an optimistic extreme in January of this year. This is evidenced by the TSI Index of Bullish Sentiment (TIBS) hitting a 20-year high at that time. Refer to the following weekly chart for details. Note that TIBS is a weighted average of four sentiment surveys (Investors Intelligence, Market Vane, Consensus-inc and American Association of Individual Investors), the 5-day moving average of the equity put/call ratio and the 5-day moving average of the VIX.

What is the probability that January’s optimistic extreme coincided with the top of the equity bull market?