WellCAD Basics - Advanced Logic Technology

1.8.2.3 Cluster Statistics
1.8.3 Building Data Clusters
BOOK 1 - WELLCAD BASICS - 215
You also extend or decrease the depth range interactively by placing your cursor on
top of the upper or lower limit of the red shaded area. Once your cursor shape
changes to a double sided vertical arrow hold the left mouse button down drag your
mouse.
The Cluster Bar provides for each cluster (see 1.8.3 Building Data Clusters) the
following statistical information for the data points falling into the cluster frame:
� Total count of points in the cluster.
� Fraction of the number of points in the cluster in relation to the total
number of points in the cross-plot.
� The Min, Max and Ave (arithmetic mean) values of the X and Y
component data values in the cluster.
� Geometric Mean of clustered points for X and Y component.
� Harmonic Mean of clustered points for X and Y component.
� Standard Deviation of clustered points for X and Y component.
If a pattern from a lithology dictionary has been assigned to a cluster the graphical
pattern and its name are shown in the first two columns of the Cluster Bar.
You can right click on a row in the Cluster Bar to open a flying menu that allows
removal of the cluster (Delete) and export of the displayed information using Copy
and paste (e.g. into Microsoft EXCEL) or Export into an ASCII file. The statistics
as shown in the Cluster Bar can be exported but it is also possible to export the
clustered data points.
A cluster is an interactively created subset of data points from the cross-plot chart.
Clusters can be used to create litho classes and show them in the Borehole
Document as Lithology Log. They can also be used as “interactive filter” allowing
the user to exclude points when adding a regression line to a data set.
Before building clusters you should open the Cluster Settings dialog box.
Cluster Settings
� Open the cluster settings from the menu View > Cluster Settings or click
the icon in the toolbar.