R: Draw Confidence Band

DrawBand {DescTools} | R Documentation

## Draw Confidence Band

### Description

Draw a (confidence) band. Just a wrapper for polygon.

### Usage

    DrawBand(x, y, col = SetAlpha("grey", 0.5), border = NA)

### Arguments

`x` | a vector or a matrix with x coordinates for the band. If x is given as matrix it must be a 2 x n matrix and the second column will be reversed. x will be recyled in the case y is a 2dimensional matrix.
`y` | a vector or a matrix with y coordinates for the band. If y is given as matrix it must be a 2 x n matrix and the second column will be reversed. y will be recyled in the case x is a 2dimensional matrix.
`col` | the color of the band.
`border` | the border color of the band.

### Author(s)

Andri Signorell <andri@signorell.net>

### See Also

`polygon`

### Examples

    set.seed(18)
    x <- rnorm(15)
    y <- x + rnorm(15)

    new <- seq(-3, 3, 0.5)
    pred.w.plim <- predict(lm(y ~ x), newdata=data.frame(x=new), interval="prediction")
    pred.w.clim <- predict(lm(y ~ x), newdata=data.frame(x=new), interval="confidence")

    plot(y ~ x)
    DrawBand(y = c(pred.w.plim[,2], rev(pred.w.plim[,3])),
      x=c(new, rev(new)), col= SetAlpha("grey90", 0.5))

    # passing y as matrix interface allows more intuitive arguments
    DrawBand(y = pred.w.clim[, 2:3],
             x = new, col= SetAlpha("grey80", 0.5))

    abline(lm(y~x), col="brown")

[Package DescTools version 0.99.34 Index]