Average Volume to Open Interest Ratio
Returns the average daily Vol/OI ratio for options on an underlying stock over a specified number of trading days. This helps establish a baseline for typical options activity.
Parameters
| Parameter | Required | Description |
|---|---|---|
| Underlying | Yes | Stock ticker symbol (e.g., AAPL, MSFT) |
| Days | Yes | Number of trading days to average |
| OptionType | No | Filter by Call, Put, or All (default: All) |
Use Cases
- Establish baseline Vol/OI for comparison
- Identify when current Vol/OI is unusually high or low
- Track changes in options activity trends
- Compare typical activity levels across stocks
Notes
- Compare current Vol/OI with average to spot unusual activity
- Higher averages indicate more actively traded options
- Useful for building alerts when Vol/OI exceeds historical average
Examples
=opt_Vol_OI_Avg("AAPL", 5)=opt_Vol_OI_Avg("MSFT", 10, "Call")=opt_Vol_OI_Avg("SPY", 20, "Put")=opt_Vol_OI_Avg(A1, 30)=opt_Vol_OI("AAPL")/opt_Vol_OI_Avg("AAPL",20)When to Use
- Establish Vol/OI baseline for a stock
- Compare current activity to historical average
- Screen for stocks with unusual activity
- Build Vol/OI-based trading signals
- Track changes in options market participation
When NOT to Use
| Scenario | Use Instead |
|---|---|
| Need today's Vol/OI only | opt_Vol_OI() |
| Need Vol/OI on specific date | opt_Vol_OI_Historical() |
| Need just volume average | opt_VolumeOptionsAverage() |
| Need just open interest | opt_OpenInterestOptions() |
Common Issues & FAQ
Q: How do I identify unusual Vol/OI?
A: Compare current Vol/OI to the average: =opt_Vol_OI("AAPL")/opt_Vol_OI_Avg("AAPL",20). Values significantly above 1 indicate unusual activity.
Q: What number of days should I use? A: Common periods are 5 days (1 week), 20 days (1 month), or 60 days (3 months). Shorter periods capture recent trends; longer periods provide more stable baselines.
Q: Why might the average vary significantly? A: Earnings announcements, product launches, or other catalysts can cause temporary spikes that affect the average.
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