Configure Multivariate Simulation Transformation Properties

The Transformation tab allows you to specify the multivariate transformation to convert the input drill hole data into independent Gaussian factors.

Activity Steps

  1. Select the Multivariate Simulation in the Project Tree.
  2. Select the Transformation tab in the Property Panel.
  3. Configure the following options as required.
    • Assays field group:
      • Assays To Transform – Select assays to use during the simulation.
      • Use compositional transformation – Perform a compositional transformation prior to the Multivariate Normal Transformation into independent Gaussian factors.
      • Type of transformation – Select from one of the following options.
        • Centre log-ratio (CLR)
        • Additive log-ratio (ALR)
        • Isometric log-ratio (ILR)
      • Compositional value – Value of the complete composition (For example, '100' for %, or '1000000' for ppm).
      • Denominator – Select a denominator from any of your assays or a filler option.
        • Use Filler – If your raw variables do not add up to the complete composition, add a filler variable during the transformation, which makes up the difference.
    • Multivariate Normal Transformation field group:
      • PPMT – Projection Pursuit Multivariate Transformation. Only one of the PPMT and GPCA fields can be checked.
      • Min Iterations – Minimum number of iterations to use during the PPMT process.
      • Max Iterations
      • Target Gaussian Percentile – Gaussian percentile at which the PPMT process stops if the percentile is reached.
      • Use Spatial Decorrelation – Perform an additional decorrelation process at a specified lag using Min/Max Autocorrelation Factors (MAF).
      • Lag Distance – Lag distance for use in the MAF process.
      • Lag Tolerance – Equal to half the Lag Distance. Read-Only.
      • GPCA – Gaussianisation using Principal Component Analysis.
      • Iterations – Number of iterations to perform during the GPCA transformation. Only one of the PPMT and GPCA fields can be checked.
  4. Select Transform to run the transformation.

    A set of continuity analyses for each factor display in the Project Tree, as well as a folder with the multivariate transformation name containing all the scatter plots between factors.