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% File src/library/stats/man/confint.Rd
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% File src/library/stats/man/confint.Rd
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% Part of the R package, https://www.R-project.org
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% Part of the R package, https://www.R-project.org
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% Copyright 1995-2017 R Core Team
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% Copyright 1995-2025 R Core Team
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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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% Portions copied from
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\name{confint}
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\name{confint}
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\title{Confidence Intervals for Model Parameters}
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\title{Confidence Intervals for Model Parameters}
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\alias{confint}
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\alias{confint}
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\alias{confint.default}
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\alias{confint.default}
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\alias{confint.lm}
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\alias{confint.lm}
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  model.  There is a default and a method for objects inheriting from class
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  model.  There is a default and a method for objects inheriting from class
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  \code{"\link{lm}"} and several other classes.
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  \code{"\link{lm}"} and several other classes.
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}
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}
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\usage{
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\usage{
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confint(object, parm, level = 0.95, \dots)
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confint(object, parm, level = 0.95, \dots)
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\S3method{confint}{default}(object, parm, level = 0.95, \dots)
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\S3method{confint}{default}(object, parm, level = 0.95, \dots)
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\S3method{confint}{lm}(object, parm, level = 0.95, \dots)
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\S3method{confint}{lm}(object, parm, level = 0.95, \dots)
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\S3method{confint}{glm}(object, parm, level = 0.95, trace = FALSE, test=c("LRT", "Rao"), \dots)
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\S3method{confint}{glm}(object, parm, level = 0.95, trace = FALSE, test=c("LRT", "Rao"), \dots)
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\S3method{confint}{nls}(object, parm, level = 0.95, \dots)
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\S3method{confint}{nls}(object, parm, level = 0.95, \dots)
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}
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}
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  1 - (1-level)/2 in \% (by default 2.5\% and 97.5\%).
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  1 - (1-level)/2 in \% (by default 2.5\% and 97.5\%).
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}
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}
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\details{
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\details{
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  \code{confint} is a generic function.  The default method is based on
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  \code{confint} is a generic function.  The default method is based on
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  inverting the Wald test, assuming approximate
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  inverting the Wald test, assuming approximate
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  normality of the estimator. It needs suitable \code{\link{coef}} and
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  normality of the estimator.  It needs suitable \code{\link{coef}} and
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  \code{\link{vcov}} methods to be available.  The default method can be
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  \code{\link{vcov}} methods to be available.  The default method can be
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  called directly for comparison with other methods. It also works for
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  called directly for comparison with other methods.  It also works for
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  fitted models in the S4 class system, provided that the \pkg{methods}
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  fitted models in the S4 class system.
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  namespace is loaded.
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  For objects of class \code{"lm"} the direct formulae based on \eqn{t}
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  For objects of class \code{"lm"} the direct formulae based on \eqn{t}
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  values are used.
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  values are used.
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  Methods for classes \code{"glm"}
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  Methods for classes \code{"glm"}