R: Multiple histograms with density and normal fits on one page

multi.hist {psych}

R Documentation

Multiple histograms with density and normal fits on one page

Description

Given a matrix or data.frame, produce histograms for each variable in a "matrix" form. Include normal fits and density distributions for each plot.

The number of rows and columns may be specified, or calculated. May be used for single variables.

Usage

multi.hist(x,nrow=NULL,ncol=NULL,density=TRUE,freq=FALSE,bcol="white",
      dcol=c("black","black"),dlty=c("dashed","dotted"),
      main="Histogram, Density, and Normal Fit",breaks=21,...)
histBy(x,var,group,density=TRUE,alpha=.5,breaks=21,col,xlab,
            main="Histograms by group",...)

Arguments

`x`	matrix or data.frame
`var`	The variable in x to plot in histBy
`group`	The name of the variable in x to use as the grouping variable
`nrow`	number of rows in the plot
`ncol`	number of columns in the plot
`density`	density=TRUE, show the normal fits and density distributions
`freq`	freq=FALSE shows probability densities and density distribution, freq=TRUE shows frequencies
`bcol`	Color for the bars
`dcol`	The color(s) for the normal and the density fits. Defaults to black.
`dlty`	The line type (lty) of the normal and density fits. (specify the optional graphic parameter lwd to change the line size)
`main`	title for each panel
`xlab`	Label for the x variable
`breaks`	The number of breaks in histBy (see hist)
`alpha`	The degree of transparency of the overlapping bars in histBy
`col`	A vector of colors in histBy (defaults to the rainbow)
`...`	additional graphic parameters (e.g., col)

Author(s)

William Revelle

Examples

multi.hist(sat.act) 
multi.hist(sat.act,bcol="red")
multi.hist(sat.act,dcol="blue")  #make both lines blue
multi.hist(sat.act,dcol= c("blue","red"),dlty=c("dotted", "solid")) 
multi.hist(sat.act,freq=TRUE)   #show the frequency plot
multi.hist(sat.act,nrow=2)
histBy(sat.act,"SATQ","gender")