Semivariance

In spatial statistics, semivariance can be described by

<math>\gamma(h)=\sum-{i=1}^n(h)\frac{(z(x+h)-z(x))^2}{n(h)}</math>

where z denotes a data value at a particular location, h is the distance between data values, and n(h) are the number of pairs of data values a distance of h apart.

A plot of the semivariance versus distance between data values is known as a semivariogram[?], or simply as a variogram[?].

Relevant topics: geostatistics

References:

1. Shine, J.A., Wakefield, G.I.: A comparison of supervised imagery classification using analyst-chosen and geostatistically-chosen training sets, 1999, http://www.geovista.psu.edu/sites/geocomp99/Gc99/044/gc-044.htm