pre.sparsereg3D: Prepearing data for model selection ('sparsereg3D.sel'...

In pejovic/sparsereg3D: An Implementation of Lasso Regression for 3D Soil Mapping.

Description

Prepearing data for model selection (sparsereg3D.sel function) and model evaluation (sparsereg3D.ncv function)

Usage

pre.sparsereg3D(response, base.model, profiles, cov.grids, use.hier = FALSE,
  poly.deg = 1, num.folds = 10, num.means = 3, use.interactions = TRUE,
  standardize = TRUE, coord.trend = TRUE, seed = 321, kmean.vars = NULL,
  cum.prop = 0.9, s = 1)

Arguments

response	Only for compositional data modeling. Default is NA. "response" specifies the names of variables in compositions. For example "response = c("sand","silt","clay")"
base.model	model description (class "formula" of form "target.variable ~ covariates + depth" or in case of compositional data modeling just "~ covariates + depth", without target variable specified in the formula.)
profiles	observations of target variable (class "SoilProfileCollection")
cov.grids	covariates (class SpatialPixelsDataFrame)
use.hier	logical. If TRUE hierarchy constraints will be enforced.
poly.deg	degree of polynomial depth function
num.folds	number of folds in crossvalidation
num.means	number of clusters in k-means clustering
use.interactions	logical. If TRUE interactions will be included in the model.
standardize	logical. If TRUE standardization will be performed.
s	Integer. Only for compositional data modeling. "s" specifies which variable in composition will be used as target variable for stratification. For example, s = 1 in composition "sand, silt, clay" specifies "sand".

Value

List of objects including:

• base.model: model description extended by polynomial terms if poly.deg is TRUE

• poly.deg: degree of polynomial depth function

• use.interactions: logical. If interactions are included in the model.

• use.hier: logical. If hierarchy constraints are enforced.

• main.effect.names: names of main effect covariates

• depth.int.names: names of interactions with depth (e.g. slope.depth)

• all.int.names: names of all interactions (not only including depth)

@keywords preprocessing

pejovic/sparsereg3D documentation built on May 25, 2019, 12:45 a.m.