kern function

Kernel regression with options for residuals and gradients.

Function to run kernel regression with options for residuals and gradients asssuming no missing data.

kern(dep.y, reg.x, tol = 0.1, ftol = 0.1, gradients = FALSE, residuals = FALSE)

Arguments

• dep.y: Data on the dependent (response) variable
• reg.x: Data on the regressor (stimulus) variables
• tol: Tolerance on the position of located minima of the cross-validation function (default =0.1)
• ftol: Fractional tolerance on the value of cross validation function evaluated at local minima (default =0.1)
• gradients: Make this TRUE if gradients computations are desired
• residuals: Make this TRUE if residuals are desired

Returns

Creates a model object mod' containing the entire kernel regression output. Type names(mod)to reveal the variety of outputs produced bynpreg' of the `np' package. The user can access all of them at will by using the dollar notation of R.

Note

This is a work horse for causal identification.

Examples

## Not run:

set.seed(34);x=matrix(sample(1:600)[1:50],ncol=2)
require(np); options(np.messages=FALSE)
k1=kern(x[,1],x[,2])
print(k1$R2) #prints the R square of the kernel regression
## End(Not run)

References

Vinod, H. D.'Generalized Correlation and Kernel Causality with Applications in Development Economics' in Communications in Statistics -Simulation and Computation, 2015, tools:::Rd_expr_doi("10.1080/03610918.2015.1122048")

See Also

See kern_ctrl.

Author(s)

Prof. H. D. Vinod, Economics Dept., Fordham University, NY