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  \emph{Data for models.}
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  \emph{Data for models.}
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  Chapter 3 of \emph{Statistical Models in S}
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  Chapter 3 of \emph{Statistical Models in S}
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  eds J. M. Chambers and T. J. Hastie, Wadsworth & Brooks/Cole.
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  eds J. M. Chambers and T. J. Hastie, 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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DF <- data.frame(a=1:3, b=letters[10:12],
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DF <- data.frame(a = 1:3, b = letters[10:12],
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                 c=seq(as.Date("2004-01-01"), by = "week", len = 3),
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                 c = seq(as.Date("2004-01-01"), by = "week", len = 3),
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                 stringsAsFactors = TRUE)
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                 stringsAsFactors = TRUE)
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data.matrix(DF[1:2])
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data.matrix(DF[1:2])
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data.matrix(DF)
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data.matrix(DF)
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}
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}
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\keyword{array}
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\keyword{array}