mca {MASS} | R Documentation

## Multiple Correspondence Analysis

### Description

Computes a multiple correspondence analysis of a set of factors.

### Usage

    mca(df, nf = 2, abbrev = FALSE)

### Arguments

`df` | A data frame containing only factors
`nf` | The number of dimensions for the MCA. Rarely 3 might be useful.
`abbrev` | Should the vertex names be abbreviated? By default these are of the form “factor.level” but if `abbrev = TRUE` they are just “level” which will suffice if the factors have distinct levels.

### Value

An object of class `"mca"`, with components

`rs` | The coordinates of the rows, in `nf` dimensions.
`cs` | The coordinates of the column vertices, one for each level of each factor.
`fs` | Weights for each row, used to interpolate additional factors in `predict.mca`.
`p` | The number of factors
`d` | The singular values for the `nf` dimensions.
`call` | The matched call.

### References

Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer.

### See Also

`predict.mca`, `plot.mca`, `corresp`

### Examples

    farms.mca <- mca(farms, abbrev=TRUE)
    farms.mca
    plot(farms.mca)

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