Focus-2.3.1
FOCUS-2.3 conducts statistical analyses on random samples of spatial data sets. The spatial data sets
are comprised of plots, which relate predictor and response variables to space. Sampling is done based
on distance constraints between plots. FOCUS-2.3 can sample either plots, which are closer to each other
than a specified distance constraint, or plots, which are farther apart from each other than a specified
distance constraint. After sampling, FOCUS-2.3 calculates linear regression coefficients and conducts an
analysis of variance. The results are reported in comma separated files, which can be further processed in
spreadsheet programs like MS Excel. In addition to the linear regression, FOCUS-2.3 can test for the
significance of polynomial regression models up to the 5th order, i.e. test for the functional stability of the
initial linear regression model. FOCUS-2.3 may also be used for sampling only and can report the
sampled variables in a separate file, which can be processed further in spreadsheet or statistical software
packages.