tomogplot {MCMCpack} | R Documentation

## Tomography Plot

### Description

tomogplot is used to produce a tomography plot (see King, 1997) for a series of partially observed 2 x 2 contingency tables.

### Usage

    tomogplot(
      r0,
      r1,
      c0,
      c1,
      xlab = "fraction of r0 in c0 (p0)",
      ylab = "fraction of r1 in c0 (p1)",
      bgcol = "white",
      ...
    )

### Arguments

`r0` | An (ntables \times 1) vector of row sums from row 0.
`r1` | An (ntables \times 1) vector of row sums from row 1.
`c0` | An (ntables \times 1) vector of column sums from column 0.
`c1` | An (ntables \times 1) vector of column sums from column 1.
`xlab` | The x axis label for the plot.
`ylab` | The y axis label for the plot.
`bgcol` | The background color for the plot.
`...` | further arguments to be passed

### Details

Consider the following partially observed 2 by 2 contingency table:

| | Y=0 | | Y=1 | |
--------- | --------- | --------- | ---------
X=0 | | Y_0 | | | | r_0
--------- | --------- | --------- | ---------
X=1 | | Y_1 | | | | r_1
--------- | --------- | --------- | ---------
| | c_0 | | c_1 | | N

where r_0, r_1, c_0, c_1, and N are non-negative integers that are observed. The interior cell entries are not observed. It is assumed that Y_0|r_0 \sim \mathcal{B}inomial(r_0, p_0) and Y_1|r_1 \sim \mathcal{B}inomial(r_1, p_1).

This function plots the bounds on the maximum likelihood estimatess for (p0, p1).

### References

Gary King, 1997. A Solution to the Ecological Inference Problem. Princeton: Princeton University Press.

Jonathan C. Wakefield. 2004. “Ecological Inference for 2 x 2 Tables.” Journal of the Royal Statistical Society, Series A. 167(3): 385445.

### See Also

`MCMChierEI`, `MCMCdynamicEI`, `dtomogplot`

### Examples

    r0 <- rpois(100, 500)
    r1 <- rpois(100, 200)
    c0 <- rpois(100, 100)
    c1 <- (r0 + r1) - c0
    tomogplot(r0, r1, c0, c1)

[Package MCMCpack version 1.5-0 Index]