# plot.NparRegOut: Plot the non-parametric regression surface. In latticeDensity: Density Estimation and Nonparametric Regression on Irregular Regions

## Description

Takes as input a NparRegOut object from the function createNparReg. This plotting function makes a countour plot of the non-parametric regression prediction surface.

## Usage

 ```1 2``` ```## S3 method for class 'NparRegOut' plot(x, ...) ```

## Arguments

 `x` An object of type NparRegOut returned by createNparReg. `...` Other arguments to be passed to functions plot, points, lines.

Ronald P. Barry

## References

Julie McIntyre, Ronald P. Barry (2018) A Lattice-Based Smoother for Regions with Irregular Boundaries and Holes. Journal of Computational and Graphical Statistics. In Press.

## Examples

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23``` ```data(nparExample) attach(nparExample) plot.new() # Simulate a response variable index1 <- (grid2[,2]<0.8)|(grid2[,1]>0.6) Z <- rep(NA,length(grid2[,1])) n1 <- sum(index1) n2 <- sum(!index1) Z[index1] <- 3*grid2[index1,1] + 4 + rnorm(n1,0,sd=0.4) Z[!index1] <- -2*grid2[!index1,1] + 4 + rnorm(n2,0,sd=0.4) # plot(polygon2,type="n") polygon(polygon2) points(grid2,pch=19,cex=0.5,xlim=c(-0.1,1)) text(grid2,labels=round(Z,1),pos=4,cex=0.5) # Following is the generation of the nonparametric # regression prediction surface. nodeFillingOutput <- nodeFilling(poly=polygon2, node_spacing=0.025) plot(nodeFillingOutput) formLatticeOutput <- formLattice(nodeFillingOutput) plot(formLatticeOutput) NparRegOut <- createNparReg(formLatticeOutput,Z,PointPattern=grid2,k=2) plot(NparRegOut) ```

### Example output

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latticeDensity documentation built on April 18, 2021, 5:06 p.m.