📈 Understanding Sigma & Volume Spikes
What is a Sigma Spike? A Sigma Spike measures unusual volatility in a stock’s return relative to its typical fluctuations over a period. It is calculated as:
Sigma Spike = Today’s Return / Yesterday’s N-day StdDev of Returns
where Return = (Today's Close / Yesterday's Close) - 1
What is a Volume Spike? A Volume Spike shows unusually high trading volume. It is calculated as:
Volume Spike = Today’s Volume / N-day Average Volume
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