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}
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}
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\description{
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\description{
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  \code{model.matrix} creates a design (or model) matrix.
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  \code{model.matrix} creates a design (or model) matrix.
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}
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}
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\details{
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\details{
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  \code{model.matrix} creates a design matrix from the description given
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  \code{model.matrix} creates a design matrix from the description
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  in \code{terms(object)}, using the data in \code{data} which must
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  given in \code{terms(object)}, using the data in \code{data} which
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  supply variables with the same names as would be created by a call to
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  must supply variables with the same names as would be created by a
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  \code{model.frame(object)} or, more precisely, by evaluating
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  call to \code{model.frame(object)} or, more precisely, by evaluating
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  \code{attr(terms(object), "variables")}.  If \code{data} is a data
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  \code{attr(terms(object), "variables")}.  If \code{data} is a data
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  frame, there may be other columns and the order of columns is not
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  frame, there may be other columns and the order of columns is not
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  important.  Any character variables are coerced to factors, with a
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  important.  Any character variables are coerced to factors.  After
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  warning.  After coercion, all the variables used on the right-hand
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  coercion, all the variables used on the right-hand side of the
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  side of the formula must be logical, integer, numeric or factor.
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  formula must be logical, integer, numeric or factor.
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  If \code{contrasts.arg} is specified for a factor it overrides the
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  If \code{contrasts.arg} is specified for a factor it overrides the
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  default factor coding for that variable and any \code{"contrasts"}
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  default factor coding for that variable and any \code{"contrasts"}
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  attribute set by \code{\link{C}} or \code{\link{contrasts}}.
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  attribute set by \code{\link{C}} or \code{\link{contrasts}}.
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