# stripchart {graphics}

### Description

`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.

### Usage

stripchart(x, ...) ## S3 method for class 'formula': stripchart((x, data = NULL, dlab = NULL, ..., subset, na.action = NULL)) ## S3 method for class 'default': 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, ...))

### Arguments

- 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`

,`points`

,`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`

### Details

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.

### Examples

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)

Documentation reproduced from R 3.0.2. License: GPL-2.