| % File src/library/stats/man/is.empty.Rd |
| % Part of the R package, https://www.R-project.org |
| % Copyright 1995-2007 R Core Team |
| % Distributed under GPL 2 or later |
| |
| \name{is.empty.model} |
| \alias{is.empty.model} |
| \title{Test if a Model's Formula is Empty} |
| \description{ |
| \R's formula notation allows models with no intercept and no |
| predictors. These require special handling internally. |
| \code{is.empty.model()} checks whether an object describes an empty |
| model. |
| } |
| \usage{ |
| is.empty.model(x) |
| } |
| \arguments{ |
| \item{x}{A \code{terms} object or an object with a \code{terms} method.} |
| } |
| |
| \value{ |
| \code{TRUE} if the model is empty |
| } |
| |
| \seealso{\code{\link{lm}}, \code{\link{glm}}} |
| |
| \examples{ |
| y <- rnorm(20) |
| is.empty.model(y ~ 0) |
| is.empty.model(y ~ -1) |
| is.empty.model(lm(y ~ 0)) |
| } |
| \keyword{models} |