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Update CaseGroupsAndStatistics.md

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Jacob Støren 2013-10-24 16:26:01 +02:00
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Documentation/UsersGuide/CaseGroupsAndStatistics.md
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## Grid Case Groups and Statistics ## Grid Case Groups and Statistics
![](images/GridCaseGroupTree.png) ![](images/GridCaseGroupTree.png)
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- **Percentile Setup**: Selects whether to calculate percentiles, what method and what percentile levels should be used. Turning this off speeds up the calculations. - **Percentile Setup**: Selects whether to calculate percentiles, what method and what percentile levels should be used. Turning this off speeds up the calculations.
- **Well Data Source Case**: This option selects which set of **Simulation Wells** to be shown along with the statistical results. You can select one of the **Source Cases**. - **Well Data Source Case**: This option selects which set of **Simulation Wells** to be shown along with the statistical results. You can select one of the **Source Cases**.
>##### Percentile Methods ##### Percentile Methods
>
>Three Percentile methods are implemented: Three Percentile methods are implemented:
>
>- **Interpolated Observation** - **Interpolated Observation**
>The values are sorted, and the two observations representing the probabilities closest to the percentile are interpolated to find the value for the percentile. This is the default method. The values are sorted, and the two observations representing the probabilities closest to the percentile are interpolated to find the value for the percentile. This is the default method.
>- **Nearest Observation** - **Nearest Observation**
>The values are sorted, and the first observation representing a probability higher or equal to the percentile probability is selected as the value for the percentile. This method is by some considered to be statistically more puristic. The values are sorted, and the first observation representing a probability higher or equal to the percentile probability is selected as the value for the percentile. This method is by some considered to be statistically more puristic.
>- **Histogram based estimate** - **Histogram based estimate**
>A histogram is created and the percentile is calculated based on the histogram. This method will be faster when having a large number of realizations, because no value sorting is involved. You would however need several hundred realizations before this method should be considered. A histogram is created and the percentile is calculated based on the histogram. This method will be faster when having a large number of realizations, because no value sorting is involved. You would however need several hundred realizations before this method should be considered.
>
#### Viewing the results #### Viewing the results
When the computation is complete, you have to create a 3D View on the **Statistics Case** to view the results. Use the Context menu available by right clicking the **Statistics Case** to create it. When the computation is complete, you have to create a 3D View on the **Statistics Case** to view the results. Use the Context menu available by right clicking the **Statistics Case** to create it.