R: residual plot for the observed values

residual.plot {arm} | R Documentation

## residual plot for the observed values

### Description

Plots the residual of observed variable.

### Usage

    residual.plot(Expected, Residuals, sigma, main = deparse(substitute(Expected)),
      col.pts = "blue", col.ctr = "red", col.sgm = "black", cex = 0.5,
      gray.scale = FALSE, xlab = "Predicted", ylab = "Residuals", ...)

### Arguments

`Expected` | Expected value.
`Residuals` | Residual value.
`sigma` | Standard error.
`main` | main for the plot. See `plot` for detail.
`col.pts` | Color of the points.
`col.ctr` | Color of the line at zero.
`col.sgm` | Color of standard error line.
`cex` | A numerical value giving the amount by which plotting text and symbols should be magnified relative to the default. See par for detail.
`gray.scale` | If `TRUE`, makes the plot into black and white. This option overwrites the color specification. Default is FALSE.
`xlab` | Label for x axis.
`ylab` | Label for y axis.
`...` | Additional parameters passed to `plot` function.

### Value

Plot to visualize pattern of residulal value for the expected value.

### Author(s)

Masanao Yajima yajima@stat.columbia.edu, M.Grazia Pittau grazia@stat.columbia.edu

### Examples

    old.par <- par(no.readonly = TRUE)

    x <- rnorm(100)
    y <- rnorm(100)
    fit <- lm(y~x)
    y.hat <- fitted(fit)
    u <- resid(fit)
    sigma <- sigma.hat(fit)
    residual.plot(y.hat, u, sigma)

    par(old.par)

[Package arm version 1.9-3 Index]