R: Plot p-value function for one 2 by 2 table.

exact2x2Plot {exact2x2} | R Documentation

## Plot p-value function for one 2 by 2 table.

### Description

Plots two-sided p-values as a function of odds ratios. Can plot three types of p-values: the two-sided Fisher's exact, the central Fisher's exact (i.e., twice the one-sided Fisher's exact), and Blaker's exact.

### Usage

    exact2x2Plot(x, y=NULL, OR = NULL, ndiv = 1000, tsmethod=NULL,
        method = NULL, paired=FALSE, orRange = NULL, dolog = TRUE,
        dolines = FALSE, dopoints = TRUE, doci=TRUE,
        alternative=c("two.sided","less","greater"),
        conf.level=.95, alphaline=TRUE, newplot = TRUE, ...)

### Arguments

`x` | matrix representing the 2 by 2 table
`y` | a factor object; ignored if `x` is a matrix.
`OR` | odds ratio values for plot, if NULL divides orRange into ndiv pieces
`ndiv` | number of pieces to divide up odds ratio range
`tsmethod` | either "minlike","blaker" or "central"
`method` | same as tsmethod, kept for backward compatability
`paired` | logical, do paired analysis giving McNemar's test p-values
`orRange` | range for calculating odds ratios
`dolog` | logical,plot odds ratios on log scale?
`dolines` | logical, add lines to a plot?
`dopoints` | logical, add points to a plot?
`doci` | logical, add vertical lines at confidence interval?
`alternative` | one of "two.sided","less","greater", type of alternative for p-values
`conf.level` | when doci=TRUE, level for confidence interval to be plotted
`alphaline` | logical, if doci=TRUE should a line be drawn at the significance level?
`newplot` | logical,start a new plot?
`...` | values passed to plot, points, or lines statement

### See Also

`exact2x2`

### Examples

    example1<-matrix(c(6,12,12,5),2,2,dimnames=list(c("Group A","Group B"),c("Event","No Event")))
    example1
    exact2x2Plot(example1)
    ## add lines from central Fisher's exact
    exact2x2Plot(example1,method="central",dolines=TRUE,newplot=FALSE,col="red")

[Package exact2x2 version 1.6.3 Index]