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While many Trend Vision One solutions use a volume-based calculation to determine your monthly credit drawdown, other solutions use a snapshot-based calculation. Once in active usage, snapshot-based solutions capture daily snapshots of how many units of the solution you are using. Your credit drawdown corresponds to the snapshot with the highest usage within the 85th percentile of snapshots (excluding the top 15% of outliers) from the active usage days that month. As the month progresses, your estimated credit drawdown for snapshot-based solutions might change.
The snapshot-based calculation takes the following steps to determine credit usage for a solution:
  1. Calculate your usage on each day of the month for the given solution.
    Important
    Important
    Trend Vision One only counts active usage days. Therefore, if you activate a snapshot-based solution on September 16, your September credit drawdown for that solution only takes into account your usage from September 16 to 30.
    Trend Micro recommends activating a new solution earlier in the month to provide a larger data set for filtering out temporary usage peaks.
    85thPercentileExample=95c5f0d3-948a-4235-813e-0a30c3dc349e.png
  2. Sort your daily usage values from lowest to highest usage.
  3. Identify the day in the 85th percentile position:
    • Take the number of days in the month.
      Example: 31 days in January
    • Multiply by 0.85.
      Example: 31 days * 0.85 = 26.35
    • Round up to the nearest whole number.
      Example: 26.35 rounds up to 27
    • Find the date in the sorted list occupying the resulting position.
      Example: Locate the 27th day in the ordered list.
      Important
      Important
      Note that the 27th day refers to the date occupying the 27th position in the ordered list, not the 27th of January. Any day in the month could occupy the 27th position, dependent on volume of usage.
  4. Your usage on the day occupying the 85th percentile position becomes your credit drawdown for the month for the given solution.
For more information on the rationale behind the snapshot-based calculation, see Why does Trend Vision One use the 85th percentile to calculate credit usage for snapshot-based solutions?