[R] Partition into quantiles

[Peter Dalgaard]

"Alberto Monteiro" <albmont at centroin.com.br> writes:

> Is there any function that divides a sample into N quantiles?
> 
> For example, for N = 2, this would be the solution:
> 
> x <- rnorm(100)
> m <- median(x)
> q <- ifelse(x <= median, 1, 2)

Have a look at

> N <- 2
> table(cut(x,quantile(x,seq(0,1,1/N)), include.lowest=TRUE))

[-2.78,0.205]  (0.205,2.22]
           50            50

> table(cut(x,c(-Inf,quantile(x,(1:(N-1))/N),Inf)))

(-Inf,0.205] (0.205, Inf]
          50           50

-- 
   O__  ---- Peter Dalgaard             Øster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
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