dudi.nsc {ade4} | R Documentation

## Non symmetric correspondence analysis

### Description

performs a non symmetric correspondence analysis.

### Usage

    dudi.nsc(df, scannf = TRUE, nf = 2)

### Arguments

`df` | a data frame containing positive or null values
`scannf` | a logical value indicating whether the eigenvalues bar plot should be displayed
`nf` | if scannf FALSE, an integer indicating the number of kept axes

### Value

Returns a list of class `nsc` and `dudi` (see `dudi`) containing also

`N` | sum of the values of the initial table

### Author(s)

Daniel Chessel chessel@biomserv.univ-lyon1.fr

### References

Kroonenberg, P. M., and Lombardo R. (1999) Nonsymmetric correspondence analysis: a tool for analysing contingency tables with a dependence structure. Multivariate Behavioral Research, 34, 367–396.

### Examples

    data(housetasks)
    nsc1 <- dudi.nsc(housetasks, scan = FALSE)
    s.label(nsc1$c1, clab = 1.25)
    s.arrow(nsc1$li, add.pl = TRUE, clab = 0.75) # see ref p.383

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