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\title{Formula Notation for Scatterplots}
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\title{Formula Notation for Scatterplots}
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\description{
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\description{
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Specify a scatterplot or add points or lines via a formula.
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Specify a scatterplot or add points or lines via a formula.
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}
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}
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\usage{
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\usage{
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\method{plot}{formula}(formula, \dots, data = parent.frame(), subset,
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\method{plot}{formula}(formula, data = parent.frame(), \dots, subset,
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ylab = varnames[response], ask = TRUE)
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ylab = varnames[response], ask = TRUE)
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\method{points}{formula}(formula, \dots, data = parent.frame(), subset)
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\method{points}{formula}(formula, data = parent.frame(), \dots, subset)
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\method{lines}{formula}(formula, \dots, data = parent.frame(), subset)
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\method{lines}{formula}(formula, data = parent.frame(), \dots, subset)
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}
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}
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\arguments{
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\arguments{
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\item{formula}{a \code{\link{formula}}, such as \code{y ~ x}.}
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\item{formula}{a \code{\link{formula}}, such as \code{y ~ x}.}
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\item{data}{a data.frame (or list) from which the variables in
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\item{data}{a data.frame (or list) from which the variables in
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\code{formula} should be taken.}
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\code{formula} should be taken.}
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\item{\dots}{Further graphical parameters may also be passed as
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arguments, see \code{\link{par}}.}
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\item{subset}{an optional vector specifying a subset of observations
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\item{subset}{an optional vector specifying a subset of observations
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to be used in the fitting process.}
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to be used in the fitting process.}
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\item{ylab}{the y label of the plot(s).}
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\item{ylab}{the y label of the plot(s).}
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\item{\dots}{Further graphical parameters may also be passed as
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arguments, see \code{\link{par}}.}
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\item{ask}{logical, see \code{\link{par}}.}
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\item{ask}{logical, see \code{\link{par}}.}
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}
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}
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\details{
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\details{
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Both the terms in the formula and the \code{\dots} arguments are
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Both the terms in the formula and the \code{\dots} arguments are
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evaluated in \code{data} enclosed in \code{parent.frame()} if
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evaluated in \code{data} enclosed in \code{parent.frame()} if
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