# Differences

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+ | # Threshold | ||

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+ | A [severity](/glossary/s/severity) of a particular type is trigged whenever the returned value from the check is higher than the configured threshold, the **baseline**. | ||

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+ | The notification threshold / baseline can be defined in several ways. | ||

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+ | ## Settings | ||

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+ | ^ Setting ^ Description ^ | ||

+ | | Method | `Constant` / `Average` / `Median` / `Deviation` | | ||

+ | | Percentage | Percentage threshold based on the calculated value. | | ||

+ | | Deviation | Number of standard deviations | | ||

+ | | Period | Time period for historical results to include in the calculation. | | ||

+ | | Offset | Constant to add to the calculated value. | | ||

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+ | ## Calculations | ||

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+ | Static calculations uses a **constant** threshold value. | ||

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+ | Dynamic methods calculate the threshold value on the fly, based on a combination of the **type** (percentage or deviation), the **method** (average, median, deviation), the **period** (time frame for historical data to use), and **offset** which is added to the calculated value. | ||

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+ | ^ Method ^ Calculation ^ Type ^ Example ^ | ||

+ | | Constant | A fixed value. | Static | `25` | | ||

+ | | Average | [Average](/glossary/a/average). | Dynamic | `120%` of the `average` returned value for the last 2 hours + offset `50`. | | ||

+ | | Median | [Median](/glossary/m/median). | Dynamic | `120%` of the `median` value for the last 2 hours + offset `50`. | | ||

+ | | Deviation | [Standard deviation](/glossary/s/standard_deviation). | Dynamic | `2 standard deviations` + `average` value for the last `2` hours + offset `50`. | | ||