[R] Found "answer" to my question on MTB's INDICATOR

[C. Joseph Lu]

Dear R-Friends,

Sorry to bother everyone with my earlier question:
    "Do we have similar R function to work like Minitab's INDICATOR?"

I found the way to make things work: e.g.,
> x <- c(2,2,5,3,6,5,NA)
> model.matrix(~ factor(x) - 1)
  factor(x)2 factor(x)3 factor(x)5 factor(x)6
1          1          0          0          0
2          1          0          0          0
3          0          0          1          0
4          0          1          0          0
5          0          0          0          1
6          0          0          1          0
attr(,"assign")
[1] 1 1 1 1

NA does not appear, fine with me.

Certainly, this is not exactly the same as Minitab's INDICATOR:

INDICATOR  C2, C11-C15

    C2          C11 C12 C13 C14 C15
    2             1   0   0   0   0
    2             1   0   0   0   0
    5 ------>     0   0   0   1   0
    3             0   1   0   0   0
    6             0   0   0   0   1
    5             0   0   0   1   0
    *             *   *   *   *   *
where * is missing code in Minitab.

Certainly, I still welcome any suggestion that you might have.

Best regards,

C. Joseph Lu
Department of Statistics
National Cheng-Kung University
Tainan, Taiwan

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