Define a linear formula for classification models

Provides a symbolic description of a fitting model. Tells the model to do a linear transformation of the input values. The `predictors_index` parameter informs the positions of fields corresponding to formula independent variables. If no value is given, that all fields will be used as predictors.

Usage

sits_formula_linear(predictors_index = -2L:0L)

Arguments

predictors_index

Index of the valid columns whose names are used to compose formula (default: -2:0).

Value

A function that computes a valid formula using a linear function.

Author

Gilberto Camara, gilberto.camara@inpe.br

Alexandre Ywata de Carvalho, alexandre.ywata@ipea.gov.br

Rolf Simoes, rolfsimoes@gmail.com

Examples

if (sits_run_examples()) {
    # Example of training a model for time series classification
    # Retrieve the samples for Mato Grosso
    # train an SVM model
    ml_model <- sits_train(samples_modis_ndvi,
        ml_method = sits_svm(formula = sits_formula_logref())
    )
    # classify the point
    point_ndvi <- sits_select(point_mt_6bands, bands = "NDVI")
    # classify the point
    point_class <- sits_classify(
        data = point_ndvi, ml_model = ml_model
    )
    plot(point_class)
}