The Nikkei 225 Hits the Brakes

Key Points:

• The Nikkei 225 Index plummeted by more than -7.5% in the short term after hitting a new all-time high.
• Its short-term market breadth also experienced a sharp and rapid decline.
• Historical data offers partial insights, indicating that the outlook is not uniformly optimistic.

Turmoil Deals a Blow to Market Fervor

The recent complex international market environment has directly impacted Japan's stock market. After setting a new high over 252 trading days, the Nikkei 225 Index saw its maximum 3-day drop exceed -7.5% within a single month.

Market Performance in Similar Scenarios

This type of scenario is rare when examining historical data. Since 2000, this signal has been triggered only 5 times, including the current episode.Related Backtest Click Here.

In such extreme cases, the market posted an average return of -0.7% one month later, with only a 25% probability of positive performance. As we have consistently noted, signals of this magnitude hold no statistical significance-they merely illustrate how the market behaved during similar extreme historical episodes.

If we slightly expand the observation window to look for instances where "a 3-day drop of over -7.5% occurred within four months of a new high", we identify 9 historical signals. While these still cannot serve as a trading signal, they provide us with some valuable insights.Related Backtest Click Here.

Long-term win rate data reminds us that a "deep V-shaped" crash on price charts alone cannot be used as a basis for safe long-term position building.

In backtesting, modify the parameters below to set the maximum interval between the occurrence of two conditions. The figure below shows the relevant backtesting settings.

A Cliff-Like Collapse in Short-Term Market Breadth

Pure price indicators are prone to noise, so let us examine the market's internal "breadth".

In recent days, this breadth indicator has plummeted from the extremely optimistic zone above 80% to the extremely oversold zone below 10% in just about four trading days.Related Backtest Click Here.

Backtest data yields more interesting results here. In the 9 previous instances of such extreme breadth collapses, the Nikkei Index delivered an average return of 9.1% over the subsequent four months-with positive returns recorded in all 9 cases.

What the Research Tells Us...

Overall, while historical data following breadth collapses shows favorable risk-reward characteristics, it cannot serve as an absolute investment endorsement due to the limitations of sample size.

Every fluctuation in financial markets is a tug-of-war between sentiment indicators and fundamental realities. In the face of the Nikkei's recent sharp adjustment, these quantitative signals are not a call to blind action. When referencing these historical win rates, we must weigh the current energy supply chain shocks and uncertainties surrounding central bank policies in our decision-making.