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Updated CaseGroupsAndStatistics.md
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next_section: octaveinterface
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title: Grid Case Groups and Statistics
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permalink: /docs/casegroupsandstatistics/
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published: true
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---
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## Grid Case Groups and Statistics
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**Grid Case Group**'s are designed to make it easy to calculate statistics per cell and per timestep of a large number of Eclipse simulation Cases with identical Grids (often labeled *realizations*).
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If you have several Eclipse simulations with different input parameters available, you can put all the realizations into a Grid Case Group and easily calculate each of the cells mean value, range and max/min values at each timestep between the realizations.
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### Creating Grid Case Groups
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#### From files
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## Creating Grid Case Groups
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### From files
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The easiest way to create a **Grid Case Group** is to use the Import command:
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**File->Import->Create Grid Case Group from Files**
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@@ -32,22 +31,21 @@ ResInsight then creates a **Grid Case Group** for you, and populates its **Sourc
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This makes it quite fast to lo ad even a quite large number of realizations.
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#### Manually
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### Manually
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A Grid Case Group can be created from the context menu available when right clicking a Result Case, Input Case or a different Grid Case Group. **Source Cases** can then be added by using the mouse to *drag and drop* cases with equal grids into the **Grid Case Group**'s **Source Case** folder.
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This is useful if you want to create statistics based only on a subset of the source cases in an already created **Grid Case Group**.
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**Drag and Drop** of cases will normally copy the cases to the new destination, but moving them is possible by pressing and holding the **Shift** key while dropping.
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### Viewing special Source Cases
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## Viewing special Source Cases
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To reduce the number of views, only a view for the first case is created automatically. If you want to inspect the results of a particular source case, right click the case and select **New view** from the context menu. A new 3D View will the be created on that particular case.
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*TIP:* To reduce memory usage, project loading time etc. it is vise to delete the 3D Views you do not need. 3D Views use a lot of system resources.
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### Statistics ##
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## Statistics
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After creating a grid case group, an empty **Statistics Case** is created for you in the **Derived Statistics** folder of the **Grid Case Group**.
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#### Setting up and Calculate
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### Setting up and Calculate
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The properties of an uncalculated and a calculated **Statistics Case** is shown below:
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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.
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- **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**.
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##### Percentile Methods
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#### Percentile Methods
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Three Percentile methods are implemented:
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@@ -71,10 +69,8 @@ The values are sorted, and the first observation representing a probability high
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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.
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#### Viewing the results
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### Viewing the results
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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.
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#### Adding Statistics Cases
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A new statistical calculation can be created by activating the context menu for **Derived Statistic->New Statistics Case**.
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### Adding Statistics Cases
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A new statistical calculation can be created by activating the context menu for **Derived Statistic->New Statistics Case**.
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