TraMineR (version 2.2-10)

plot.stslist.statd: Plot method for objects produced by the seqstatd function

Description

This is the plot method for output produced by the seqstatd function, i.e for objects of class stslist.statd.

Usage

# S3 method for stslist.statd
plot(x, type = "d", cpal = NULL,
  ylab = NULL, yaxis = TRUE,
  xaxis = TRUE, xtlab = NULL, xtstep = NULL,
  tick.last = NULL,
  cex.axis = par("cex.axis"),
  space = 0, xlab = NULL, lwd=3.5, col="blue",
  ylim=NULL, cex.plot, ...)

Value

The plotted values, i.e. for type="d" the cross-sectional distributions, for type="Ht" the cross-sectional entropies, and for type="dH" the x

stslist.statd object.

Arguments

x

an object of class stslist.statd as produced by the seqstatd function.

type

if "d" (default), a state distribution plot is produced. If "Ht" an entropy index plot is produced.

cpal

alternative color palette to be used for the states. If user specified, a vector of colors with number of elements equal to the number of states in the alphabet. By default, the 'cpal' attribute of the x object is used.

ylab

an optional label for the y axis. If set to NA, no label is drawn.

yaxis

Logical. Should the y axis be displayed? Default is TRUE.

xaxis

Logical. Should the x-axis be displayed? Default is TRUE.

xtlab

optional labels for the ticks of the x-axis. If unspecified, the names attribute of the input x object is used.

xtstep

optional interval at which the tick-marks and labels of the x-axis are displayed. For example, with xtstep=3 a tick-mark is drawn at position 1, 4, 7, etc... The display of the corresponding labels depends on the available space and is dealt with automatically. If unspecified, the xtstep attribute of the x object is used.

tick.last

Logical. Should a tick mark be enforced at the last position on the x-axis? If unspecified, the tick.last attribute of the x object is used.

cex.axis

Axis annotation magnification. See par.

space

the space between the stacked bars. Default is 0, i.e. no space.

xlab

Optional title for the x axis. See title.

lwd

Width of entropy line. Default is 3.5. Ignored when type="d".

col

Color of entropy line. Default is "blue". Ignored when type="d".

ylim

Real vector of length two. Limits of the y-axis for the entropy line. Default is NULL. Ignored when type="d".

cex.plot

Deprecated. Use cex.axis instead.

...

further graphical parameters such as las to control orientation of tick labels (see par) and barplot arguments such as border=NA to remove the borders of the bars.

Author

Alexis Gabadinho and Gilbert Ritschard

Details

This is the plot method for output produced by the seqstatd function, i.e. for objects of class stslist.statd. If type="d" it produces a state distribution plot presenting the sequence of the transversal state frequencies at each successive (time) position, as computed by the seqstatd function. With type="Ht", the series of entropies of the transversal state distributions is plotted. With type="dH" the entropy line is overlayed on the state distribution plot.

When ylim=NULL, ylim is set as c(0,1) when entropy is normalized and otherwise as c(0,1.1*max(entropy)).

This plot method is called by the generic seqplot function (if type="d", type="Ht", or "dH") that produces more sophisticated plots, allowing grouping and automatic display of the state color legend. The seqdplot, seqHtplot, and seqdHplot functions are aliases for calling seqplot with type="d", type="Ht", and dH respectively.

Examples

## Defining a sequence object with the data in columns 10 to 25
## (family status from age 15 to 30) in the biofam data set
data(biofam)
biofam.lab <- c("Parent", "Left", "Married", "Left+Marr",
"Child", "Left+Child", "Left+Marr+Child", "Divorced")
biofam.seq <- seqdef(biofam, 10:25, labels=biofam.lab)

## State distribution
biofam.statd <- seqstatd(biofam.seq)

## State distribution plot (default type="d" option)
plot(biofam.statd)

## Entropy index plot
plot(biofam.statd, type="Ht")

## State distribution and entropy line
plot(biofam.statd, type="dH")