R: Component Density for a Parameterized MVN Mixture Model

cdensE {mclust} | R Documentation

## Component Density for a Parameterized MVN Mixture Model

### Description

Computes component densities for points in a parameterized MVN mixture model.

### Usage

    cdensE(data, logarithm = FALSE, parameters, warn = NULL, ...)
    cdensV(data, logarithm = FALSE, parameters, warn = NULL, ...)
    cdensX(data, logarithm = FALSE, parameters, warn = NULL, ...)
    cdensEII(data, logarithm = FALSE, parameters, warn = NULL, ...)
    cdensVII(data, logarithm = FALSE, parameters, warn = NULL, ...)
    cdensEEI(data, logarithm = FALSE, parameters, warn = NULL, ...)
    cdensVEI(data, logarithm = FALSE, parameters, warn = NULL, ...)
    cdensEVI(data, logarithm = FALSE, parameters, warn = NULL, ...)
    cdensVVI(data, logarithm = FALSE, parameters, warn = NULL, ...)
    cdensEEE(data, logarithm = FALSE, parameters, warn = NULL, ...)
    cdensEEV(data, logarithm = FALSE, parameters, warn = NULL, ...)
    cdensVEV(data, logarithm = FALSE, parameters, warn = NULL, ...)
    cdensVVV(data, logarithm = FALSE, parameters, warn = NULL, ...)
    cdensEVE(data, logarithm = FALSE, parameters, warn = NULL, ...)
    cdensEVV(data, logarithm = FALSE, parameters, warn = NULL, ...)
    cdensVEE(data, logarithm = FALSE, parameters, warn = NULL, ...)
    cdensVVE(data, logarithm = FALSE, parameters, warn = NULL, ...)
    cdensXII(data, logarithm = FALSE, parameters, warn = NULL, ...)
    cdensXXI(data, logarithm = FALSE, parameters, warn = NULL, ...)
    cdensXXX(data, logarithm = FALSE, parameters, warn = NULL, ...)

### Arguments

`data` | A numeric vector, matrix, or data frame of observations. Categorical variables are not allowed. If a matrix or data frame, rows correspond to observations and columns correspond to variables.
`logarithm` | A logical value indicating whether or not the logarithm of the component densities should be returned. The default is to return the component densities, obtained from the log component densities by exponentiation.
`parameters` | The parameters of the model: `mean` The mean for each component. If there is more than one component, this is a matrix whose kth column is the mean of the kth component of the mixture model. `variance` A list of variance parameters for the model. The components of this list depend on the model specification. See the help file for `mclustVariance` for details. `pro` Mixing proportions for the components of the mixture. If the model includes a Poisson term for noise, there should be one more mixing proportion than the number of Gaussian components.
`warn` | A logical value indicating whether or not a warning should be issued when computations fail. The default is `warn=FALSE`.
`...` | Catches unused arguments in indirect or list calls via `do.call`.

### Value

A numeric matrix whose `[i,j]`th entry is the density of observation i in component j. The densities are not scaled by mixing proportions.

### Note

When one or more component densities are very large in magnitude, then it may be possible to compute the logarithm of the component densities but not the component densities themselves due to overflow.

### See Also

`cdens`, `dens`, `mclustVariance`, `mstep`, `mclust.options`, `do.call`.

### Examples

    ## Not run:
    z2 <- unmap(hclass(hcVVV(faithful),2)) # initial value for 2 class case

    model <- meVVV(data=faithful, z=z2)
    cdensVVV(data=faithful, logarithm = TRUE, parameters = model$parameters)

    data(cross)
    z2 <- unmap(cross[,1])

    model <- meEEV(data = cross[,-1], z = z2)

    EEVdensities <- cdensEEV( data = cross[,-1], parameters = model$parameters)

    cbind(cross[,-1],map(EEVdensities))
    ## End(Not run)

[Package mclust version 5.4.5 Index]