Description Usage Arguments Details Value Note Author(s) See Also Examples

Among the many ways to describe a data set, one is density plot for each value of a grouping variable and another is violin plot of multiple variables. A density plot shows the density for different groups to show effect sizes. A violin plot is similar to a box plot but shows the actual distribution. Median and 25th and 75th percentile lines are added to the display. If a grouping variable is specified, violinBy will draw violin plots for each variable and for each group.

1 2 3 4 5 | ```
violinBy(x,var=NULL,grp=NULL,grp.name=NULL,ylab="Observed",xlab="",main="Density plot",
alpha= 1,adjust=1,restrict=TRUE,xlim=NULL,add=FALSE,col=NULL,pch=20,scale=NULL,...)
densityBy(x,var=NULL,grp=NULL,freq=FALSE,col=c("blue","red","black"),alpha=.5,adjust=1,
xlab="Variable", ylab="Density",main="Density Plot")
``` |

`x` |
A matrix or data.frame |

`var` |
The variable(s) to display |

`grp` |
A grouping variable |

`grp.name` |
If the grouping variable is specified, then what names should be give to the group? Defaults to 1:ngrp |

`ylab` |
The y label |

`xlab` |
The x label |

`main` |
Figure title |

`alpha` |
A degree of transparency (0=transparent ... 1 not transparent) |

`adjust` |
Allows smoothing of density histograms when plotting variables like height |

`freq` |
if TRUE, then plot frequencies (n * density) |

`restrict` |
Restrict the density to the observed max and min of the data |

`xlim` |
if not specified, will be .5 beyond the number of variables |

`add` |
Allows overplotting |

`col` |
Allows for specification of colours. The default for 2 groups is blue and red, for more group levels, rainbows. |

`pch` |
The plot character for the mean is by default a small filled circle. To not show the mean, use pch=NA |

`scale` |
If NULL, scale the widths by the square root of sample size, otherwise scale by the value supplied. |

`...` |
Other graphic parameters |

Describe the data using a violin plot. Change alpha to modify the shading. The grp variable may be used to draw separate violin plots for each of multiple groups.

The density (y axis) by value (x axis) of the data (for densityBy) or a violin plot for each variable (perhaps broken down by groups)

Nothing yet

William Revelle

`describe`

, `describeBy`

and `statsBy`

for descriptive statistics and `error.bars`

`error.bars.by`

and `bi.bars`

for graphic displays

1 2 3 4 |

psych documentation built on May 7, 2018, 1:04 a.m.

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