psych (version 2.1.9)

# polychor.matrix: Phi or Yule coefficient matrix to polychoric coefficient matrix

## Description

A set of deprecated functions that have replaced by `Yule2tetra` and `Yule2phi`.

Some older correlation matrices were reported as matrices of Phi or of Yule correlations. That is, correlations were found from the two by two table of counts:

 a b c d

With marginal frequencies of a+b, c+d, a+c, b+d.

Given a square matrix of such correlations, and the proportions for each variable that are in the a + b cells, it is possible to reconvert each correlation into a two by two table and then estimate the corresponding polychoric correlation (using John Fox's polychor function.

## Usage

```Yule2poly.matrix(x, v)  #deprectated
phi2poly.matrix(x, v)     #deprectated
Yule2phi.matrix(x, v)     #deprectated```

## Arguments

x

a matrix of phi or Yule coefficients

v

A vector of marginal frequencies

## Value

A matrix of correlations

## Details

These functions call `Yule2poly`, `Yule2phi` or `phi2poly` for each cell of the matrix. See those functions for more details. See `phi.demo` for an example.

## Examples

Run this code
``````# NOT RUN {
#demo <- phi.demo()
#compare the phi (lower off diagonal and polychoric correlations (upper off diagonal)
#show the result from poly.mat
#round(demo\$tetrachoric\$rho,2)
#show the result from phi2poly
#tetrachorics above the diagonal, phi below the diagonal
#round(demo\$phis,2)

# }
``````

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