STATISTICAL ANALYSIS MODULES

AUTOCORR

Computes Moran+s -I+ first lag autocorrelation statistic for an image, along with confidence tests. Non-rectangular regions can be analyzed by defining a binary mask.

CENTER

Computes mean center (weighted or not) of a point distribution and standard radius (the two-dimensional equivalent of a standard deviation).

CRATIO

Computes the compactness ratio of polygons given corresponding area and perimeter images.

QUADRAT

Computes the density, variance and variance-mean ratio of quadrat cell counts.

TREND

Calculates the best fit linear, quadratic or cubic trend surface to a set of irregular cell control points by least-squares procedures. Produces new images of the trend surfaces in addition to surface statistics.

CROSSTAB

Performs image crosstabulation and crosscorrelation.

RANDOM

Creates random images according to either a rectilinear or normal distribution. In the case of a normal distribution, the mean and standard deviation to be used may be specified.

PROFILE

Creates profiles over space or over time.

REGRESS

Performs regression analysis on images or attribute values files.

SAMPLE

Creates systematic, random and stratified random point sampling schemes.

PATTERN

Evaluates pattern measures of relative richness, diversity, dominance index, fragmentation index, NDC, CVN and BCM.

see also HISTO and EXTRACT .

Back to index!


idrisi resource center idrisi gis idrisi gis idrisi resource center idrisi gis idrisi gis idrisi resource center idrisi gis idrisi gis idrisi resource center idrisi gis idrisi gis idrisi resource center idrisi gis idrisi gis idrisi resource center idrisi gis idrisi gis idrisi resource center idrisi gis idrisi gis idrisi resource center idrisi gis idrisi gis idrisi resource center idrisi gis idrisi gis idrisi resource center idrisi gis idrisi gis idrisi resource center idrisi gis idrisi gis idrisi resource center idrisi gis idrisi gis idrisi resource center idrisi gis idrisi gis idrisi resource center idrisi gis idrisi gis idrisi resource center idrisi gis idrisi gis idrisi resource center idrisi gis idrisi gis