# cell.corregp: Confidence Ellipses for Correspondence Regression In corregp: Functions and Methods for Correspondence Regression

## Description

Method to compute confidence ellipses for coordinates in correspondence regression.

## Usage

 ```1 2 3 4 5``` ```## S3 method for class 'corregp' cell(object, parm = "x", axes = 1:2, cl = 0.95, np = 100, ...) cell(object, ...) ```

## Arguments

 `object` The output of a call to `corregp` (i.e. an object of class "corregp"). `parm` The parameter for which to compute the confidence ellipses. Can be either `"y"`, `"x"`, or any vector of term names in X, level names in X or level names in Y. Defaults to `"x"`. `axes` The axes for which to compute the confidence ellipses: a vector of two values. Defaults to the first two axes. `cl` The confidence level for the confidence ellipses. Defaults to `0.95`. `np` The number of points to represent the confidence ellipses. Defaults to `100`. `...` Further arguments passed to or from other methods.

## Details

`cell` (of a `corregp` output) makes use of `ellipse` from the package ellipse.

Typically, `cell` is not so much used directly as it is called by a `plot.corregp` command.

## Value

A list containing `np` points for each confidence ellipse of interest.

`plot.corregp`.
 ```1 2 3 4``` ```data(HairEye) haireye.crg <- corregp(Eye ~ Hair * Sex, data = HairEye, b = 3000) cell(haireye.crg, parm = "y") cell(haireye.crg, parm = c("Hair", "Sex")) ```