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\arguments{
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\arguments{
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 \item{xy}{a \code{sortedXyData} object}
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 \item{xy}{a \code{sortedXyData} object}
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}
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}
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\description{
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\description{
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  Fits the asymptotic regression model, in the form \code{b0 +
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  Fits the asymptotic regression model, in the form \code{b0 +
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      b1*(1-exp(-exp(lrc) * x)} to the \code{xy} data.
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      b1*(1-exp(-exp(lrc) * x))} to the \code{xy} data.
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  This can be used as a building block in determining starting estimates
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  This can be used as a building block in determining starting estimates
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  for more complicated models.
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  for more complicated models.
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}
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}
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\value{
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\value{
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  A numeric value of length 3 with components labelled \code{b0},
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  A numeric value of length 3 with components labelled \code{b0},