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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  \emph{The New S Language}.
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  \emph{The New S Language}.
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  Wadsworth \& Brooks/Cole.
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  Wadsworth \& Brooks/Cole.
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}
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}
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\examples{
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\examples{
- 
 
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require(stats) # for spline
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xx <- -9:9
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xx <- -9:9
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plot(xx, sqrt(abs(xx)),  col = "red")
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plot(xx, sqrt(abs(xx)),  col = "red")
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lines(stats::spline(xx, sqrt(abs(xx)), n=101), col = "pink")
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lines(spline(xx, sqrt(abs(xx)), n=101), col = "pink")
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}
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}
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\keyword{math}
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\keyword{math}