R-squared of Gaussian GAM predictions vs. observations

Fits a Gaussian GAM model y ~ s(x) (y ~ x if x is non-numeric) with the numeric response y and the numeric, character or factor predictor x using mgcv::gam() and returns the R-squared of the observations against the predictions (see score_r2()).

Supports cross-validation via the arguments arguments cv_training_fraction (numeric between 0 and 1) and cv_iterations (integer between 1 and n) introduced via ellipsis (...). See preference_order() for further details.

Usage

f_numeric_gam(df, ...)

Arguments

df

(required, dataframe) with columns:

• x: (numeric, character, factor) predictor.

• y (numeric) continuous response.

...

(optional) Accepts the arguments cv_training_fraction (numeric between 0 and 1) and cv_iterations (integer between 1 and Inf) for cross validation.

Value

numeric or numeric vector: R-squared

See also

Other preference_order_functions: f_binomial_gam(), f_binomial_glm(), f_binomial_rf(), f_categorical_rf(), f_count_gam(), f_count_glm(), f_count_rf(), f_numeric_glm(), f_numeric_rf(), preference_order()

Examples

data(vi_smol, package = "spatialData")

df <- data.frame(
  y = vi_smol[["vi_numeric"]],
  x = vi_smol[["swi_max"]]
)

#no cross-validation
f_numeric_gam(df = df)
#> [1] 0.4983268

#cross-validation
f_numeric_gam(
  df = df,
  cv_training_fraction = 0.5,
  cv_iterations = 10
  )
#>  [1] 0.4523571 0.4930217 0.4933019 0.4653087 0.4682021 0.4389428 0.5188004
#>  [8] 0.4856046 0.4669182 0.4797559

#categorical predictor
df <- data.frame(
  y = vi_smol[["vi_numeric"]],
  x = vi_smol[["koppen_zone"]]
)

f_numeric_gam(df = df)
#> [1] 0.7071346