ORB Expansion Ratios

Forty two percent of the total daily volatility often occurs within the first hour of regular trading hours. Data patterns found in every teardown orb trading nasdaq brandedvideo has logged shows the same thing regarding the relationship between the initial volatility and the total session high. Calculating the orb expansion ratio requires measuring the width of the opening range against the final daily range to determine if the expansion is mathematically probable.

Calculating the Expansion Ratio

The math starts at the market open. A trader measures the distance between the high and the low of the first fifteen minutes. This five minute range or fifteen minute range becomes the base unit. If a 15 minute range covers ten dollars and the total day covers fifty dollars, the expansion ratio is five. This ratio stays consistent across different market conditions during the intraday period. A small sample overstates the edge. Large datasets show that the ratio tends to revert to a mean value after the first hour of trading.

Timeframe Selection and Volatility

Selection of a specific timeframe changes the ratio. A thirty minute range provides a wider base than a 5 minute measurement. Using a sixty minute range often results in a lower expansion ratio because the initial volatility has already consumed a larger portion of the total daily movement. The opening range breakout depends on these initial boundaries. If the price breaks the high of the thirty minute range, the projected total range expands accordingly. The calculation must account for the premarket volume to ensure the initial range is not an outlier.

The Role of the Opening Bell

The opening bell sets the initial parameters. High volume at the cash open creates a wider opening range. A wider range typically results in a smaller expansion ratio. For example, a large opening range might represent sixty percent of the total daily range. Conversely, a narrow opening range might only represent ten percent of the total movement. Measuring this ratio helps in predicting if the current movement is an opening range breakout or a mid day reversal. The data shows that the ratio fluctuates based on the overnight session activity.

Expansion during Power Hour

The final movement often occurs during power hour. The expansion ratio provides a metric to judge if the price is nearing its statistical limit for the day. If the current price action suggests a total range that exceeds the historical expansion ratio by a significant margin, the move lacks mechanical support. The session high is often reached when the expansion ratio hits a specific threshold relative to the opening range. This happens frequently after the first hour has concluded.