stripchart {graphics} | R Documentation |

`stripchart`

produces one dimensional scatter plots (or dot
plots) of the given data. These plots are a good alternative to
`boxplot`

s when sample sizes are small.

stripchart(x, ...) ## S3 method for class 'formula': stripchart(x, data = NULL, dlab = NULL, ..., subset, na.action = NULL) ## Default S3 method: stripchart(x, method = "overplot", jitter = 0.1, offset = 1/3, vertical = FALSE, group.names, add = FALSE, at = NULL, xlim = NULL, ylim = NULL, ylab=NULL, xlab=NULL, dlab="", glab="", log = "", pch = 0, col = par("fg"), cex = par("cex"), axes = TRUE, frame.plot = axes, ...)

`x` |
the data from which the plots are to be produced. In the default
method the data can be specified as a single numeric vector, or as list of numeric
vectors, each corresponding to a component plot. In the `formula`
method, a symbolic specification of the form `y ~ g` can be given,
indicating the observations in the vector `y` are to be
grouped according to the levels of the factor `g` . `NA` s
are allowed in the data. |

`data` |
a data.frame (or list) from which the variables in
`x` should be taken. |

`subset` |
an optional vector specifying a subset of observations to be used for plotting. |

`na.action` |
a function which indicates what should happen
when the data contain `NA` s. The default is to ignore missing
values in either the response or the group. |

`...` |
additional parameters passed to the default method, or by
it to `plot` , `axis` and `title` to control the
appearance of the plot. |

`method` |
the method to be used to separate coincident points.
The default method `"overplot"` causes such points to be
overplotted, but it is also possible to specify `"jitter"` to
jitter the points, or `"stack"` have coincident points
stacked. The last method only makes sense for very granular data. |

`jitter` |
when `method="jitter"` is used, `jitter`
gives the amount of jittering applied. |

`offset` |
when stacking is used, points are stacked this many line-heights (symbol widths) apart. |

`vertical` |
when vertical is `TRUE` the plots are drawn
vertically rather than the default horizontal. |

`group.names` |
group labels which will be printed alongside (or underneath) each plot. |

`add` |
logical, if true add the chart to the current plot. |

`at` |
numeric vector giving the locations where the charts should
be drawn, particularly when `add = TRUE` ;
defaults to `1:n` where `n` is the number of boxes. |

`ylab, xlab` |
labels: see `title` . |

`dlab, glab` |
alternate way to specify axis labels: see ‘Details’. |

`xlim, ylim` |
plot limits: see `plot.window` . |

`log` |
on which axes to use a log scale: see
`plot.default` |

`pch, col, cex` |
Graphical parameters: see `par` . |

`axes, frame.plot` |
Axis control: see `plot.default` |

Extensive examples of the use of this kind of plot can be found in Box, Hunter and Hunter or Seber and Wild.

The `dlab`

and `glab`

labels may be used instead of `xlab`

and `ylab`

if those are not specified. `dlab`

applies to the
continuous data axis (the X axis unless `vertical`

is `TRUE`

),
`glab`

to the group axis.

x <- stats::rnorm(50) xr <- round(x, 1) stripchart(x) ; m <- mean(par("usr")[1:2]) text(m, 1.04, "stripchart(x, \"overplot\")") stripchart(xr, method = "stack", add = TRUE, at = 1.2) text(m, 1.35, "stripchart(round(x,1), \"stack\")") stripchart(xr, method = "jitter", add = TRUE, at = 0.7) text(m, 0.85, "stripchart(round(x,1), \"jitter\")") stripchart(decrease ~ treatment, main = "stripchart(OrchardSprays)", vertical = TRUE, log = "y", data = OrchardSprays) stripchart(decrease ~ treatment, at = c(1:8)^2, main = "stripchart(OrchardSprays)", vertical = TRUE, log = "y", data = OrchardSprays)

[Package *graphics* version 2.8.0 Index]