Global Topcut Analysis

Topcutting, also know as capping, is used to reduce the impact of extreme values on a skewed dataset. In Supervisor, topcutting involves selecting a topcut value by analysing the histogram, probability plot, mean and variance plot, and cumulative metal plot. This allows the user to jointly analyse the impact of various topcuts using the statistical distribution as well as the cumulative amount of metal. Setting a topcut value results in all values above it being lowered to the topcut value.

Note: Topcutting does not remove values from future calculations. To remove or filter out values, see Data Filters.

Topcut values can be set independently for each plot, or linked. If set independently then the global topcut is calculated as the average of all four values set in each graph. Topcut values can be entered manually or selected interactively using the slider bars on each of the graphs.

Once a global topcut is calculated, different numerical results display to compare the values before and after applying the topcut. The percentage of change is also reported.