# Sample and Variable Selection

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#### Sample Selection

- distslct - Selects samples on outside of data space.
- doptimal - Selects samples based on D-Optimal criteria.
- kennardstone - Select a subset of samples from a data set by the Kennard-Stone algorithm.
- reducennsamples - Selects a subset of samples by removing nearest neighbors.
- stdsslct - Selects data subsets (often for use in standardization).

#### Variable Selection

- fullsearch - Exhaustive Search Algorithm for small problems.
- genalg - Genetic Algorithm for Variable Selection. See also Genetic Algorithms for Variable Selection.
- gaselctr - Genetic algorithm for variable selection with PLS.
- ipls - Interval PLS variable selection. See also Interval PLS (IPLS) for Variable Selection.
- rpls - Recursive PLS (and PCR) variable selection.
- calibsel - Statistical procedure for variable selection.
- vip - Calculate Variable Importance in Projection from regression model.
- sratio - Calculates selectivity ratio for a given regression model.
- selectvars - Selects variables that are predictive.

#### Variable Correlation Analysis

- corrmap - Correlation map with variable grouping.
- durbin_watson - Criterion for measure of continuity.
- super_reduce - Eliminates highly correlated variables.

#### Related Tools

- lamsel - Determines indices of wavelength axes in specified ranges.
- specedit - GUI for selecting spectral regions on a plot.
- fullsearch - Exhaustive Search Algorithm for small problems.

(Sub topic of Statistics and Editing Preprocessing and Standardization)