# stripchart

##### 1-D Scatter Plots

`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.

- Keywords
- hplot

##### Usage

`stripchart(x, …)`# S3 method for formula
stripchart(x, data = NULL, dlab = NULL, …,
subset, na.action = NULL)

# S3 method for 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.window`

,`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

`library(graphics)`

```
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 package graphics, version 3.4.0, License: Part of R 3.4.0*