nStress

kStress

A named list produced by a squeeze function of 
    class <code>sod_sq3</code>.
  


  Functions that return stress values normalised by the total distance
  between nodes.
  <ul>
<li>
    <code>kStress</code> returns a vector of Kruskal stress (sum of
    squared errors) / (squared distances).
    </li>
<li>
    <code>nStress</code> returns a vector of absolute errors divided by the
    sum of all distances.
  </li>
</ul><p></p><p></p>

SOD.stress.functions

SOD (Self-Organising-Deltoids) provides multidimensional scaling by gradually reducing the dimensionality of an initial space and using the resulting stress in the configuration to re-arrange nodes. Stress is calculated from the errors in the inter-node distances, and the sum of the stresses at each node is combined to create N-dimensional force vectors that direct the movement of nodes as the dimensionality is iteratively reduced.

SOD.stress.functions: SOD normalised stress values

Description

Usage

Arguments

See Also

Examples