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, method = "overplot", jitter = 0.1, offset = 1/3, vertical = FALSE, group.names, add = FALSE, at = NULL, xlim = NULL, ylim = NULL, main = "", ylab = "", xlab = "", log = "", pch = 0, col = par("fg"), cex = par("cex"))

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

`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. |

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

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

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

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

x <- 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\")") with(OrchardSprays, stripchart(decrease ~ treatment, main = "stripchart(Orchardsprays)", ylab = "decrease", vertical = TRUE, log = "y")) with(OrchardSprays, stripchart(decrease ~ treatment, at = c(1:8)^2, main = "stripchart(Orchardsprays)", ylab = "decrease", vertical = TRUE, log = "y"))

[Package *graphics* version 2.5.0 Index]