# mcoa: Multiple CO-inertia Analysis In ade4: Analysis of Ecological Data: Exploratory and Euclidean Methods in Environmental Sciences

 mcoa R Documentation

## Multiple CO-inertia Analysis

### Description

performs a multiple CO-inertia analysis, using an object of class `ktab`.

### Usage

```mcoa(X, option = c("inertia", "lambda1", "uniform", "internal"),
scannf = TRUE, nf = 3, tol = 1e-07)
## S3 method for class 'mcoa'
print(x, ...)
## S3 method for class 'mcoa'
summary(object, ...)
## S3 method for class 'mcoa'
plot(x, xax = 1, yax = 2, eig.bottom = TRUE, ...)
```

### Arguments

 `X` an object of class `ktab` `option` a string of characters for the weightings of the arrays options : "inertia"weighting of group k by the inverse of the total inertia of the array k "lambda1"weighting of group k by the inverse of the first eigenvalue of the k analysis "uniform"uniform weighting of groups "internal"weighting included in `X\$tabw` `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 `tol` a tolerance threshold, an eigenvalue is considered positive if it is larger than `-tol*lambda1` where `lambda1` is the largest eigenvalue. `x, object` an object of class 'mcoa' `...` further arguments passed to or from other methods `xax, yax` the numbers of the x-axis and the y-axis `eig.bottom` a logical value indicating whether the eigenvalues bar plot should be added

### Value

mcoa returns a list of class 'mcoa' containing :

 `pseudoeig` a numeric vector with the all pseudo eigenvalues `call` the call-up order `nf` a numeric value indicating the number of kept axes `SynVar` a data frame with the synthetic scores `axis` a data frame with the co-inertia axes `Tli` a data frame with the co-inertia coordinates `Tl1` a data frame with the co-inertia normed scores `Tax` a data frame with the inertia axes onto co-inertia axis `Tco` a data frame with the column coordinates onto synthetic scores `TL` a data frame with the factors for Tli Tl1 `TC` a data frame with the factors for Tco `T4` a data frame with the factors for Tax `lambda` a data frame with the all eigenvalues (computed on the separate analyses) `cov2` a numeric vector with the all pseudo eigenvalues (synthetic analysis)

### Author(s)

Daniel Chessel
Anne-Béatrice Dufour anne-beatrice.dufour@univ-lyon1.fr

### References

Chessel, D. and Hanafi, M. (1996) Analyses de la co-inertie de K nuages de points, Revue de Statistique Appliquée, 44, 35–60.

### Examples

```data(friday87)
w1 <- data.frame(scale(friday87\$fau, scal = FALSE))
w2 <- ktab.data.frame(w1, friday87\$fau.blo, tabnames = friday87\$tab.names)
mcoa1 <- mcoa(w2, "lambda1", scan = FALSE)
mcoa1
summary(mcoa1)
plot(mcoa1)
```

ade4 documentation built on Nov. 2, 2022, 1:07 a.m.