model.matrix,BFBayesFactor-method | R Documentation |

This function returns the design matrix used for computation of the Bayes factor
for the numerator of a `BFBayesFactor`

object. There must not be more
than one numerator in the `BFBayesFactor`

object.

```
## S4 method for signature 'BFBayesFactor'
model.matrix(object, ...)
## S4 method for signature 'BFBayesFactorTop'
model.matrix(object, ...)
```

`object` |
a BayesFactor object with a single numerator |

`...` |
arguments passed to and from related methods |

Returns the design matrix for the corresponding model. The 'gMap' attribute of the returned matrix contains the mapping from columns of the design matrix to g parameters

Rouder, J. N., Morey, R. D., Speckman, P. L., Province, J. M., (2012) Default Bayes Factors for ANOVA Designs. Journal of Mathematical Psychology. 56. p. 356-374.

```
## Gets the design matrix for a simple analysis
data(sleep)
bf = anovaBF(extra ~ group + ID, data = sleep, whichRandom="ID", progress=FALSE)
X = model.matrix(bf)
## Show dimensions of X (should be 20 by 12)
dim(X)
```

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