[R] Help needed in R

[Henrique Dallazuanna]

Try this:

data <- as.data.frame(data)
names(data) <- c('Data', 'Indicator')

a)
sort(unique(subset(data, Indicator == 1))[,1])

b)  with(subset(data, Indicator == 1),
              tapply(Indicator, Data, sum))



On 01/03/2008, AbouEl-Makarim Aboueissa <aaboueissa at usm.maine.edu> wrote:
> Dear ALL:
>
> I have two quick questions about how to perform some steps in R. Could you
> please see the attached MS file if the data not clean enough in this email.
>
> Thank you so much for all your helps.
>
>
> Abou
>
>
>
> Here it is:
> =========================
>
> Consider the following matrix:
>
> data<-matrix(c(2,2,12,2,1,10,10,4,10,1,1,2,2,1,2,10,3,1,1,1,3,5,17,23,9,9,3,3,15,5,
> 		  4,5,5,5,4,8,1,15,3,3,1,6,3,6,3,4,5,14,4,
> 		  0,0,0,0,0,1,1,0,1,1,0,1,1,0,0,1,0,1,0,0,0,1,0,0,0,0,0,0,1,1,0,1,1,1,0,
> 		  0,0,0,0,0,0,0,0,0,0,0,0,0,0),49,2)
>
>
>       [,1] [,2]
>  [1,]    2    0
>  [2,]    2    0
>  [3,]   12    0
>  [4,]    2    0
>  [5,]    1    0
>  [6,]   10    1
>  [7,]   10    1
>  [8,]    4    0
>  [9,]   10    1
> [10,]    1    1
> [11,]    1    0
> [12,]    2    1
> [13,]    2    1
> [14,]    1    0
> [15,]    2    0
> [16,]   10    1
> [17,]    3    0
> [18,]    1    1
> [19,]    1    0
> [20,]    1    0
> [21,]    3    0
> [22,]    5    1
> [23,]   17    0
> [24,]   23    0
> [25,]    9    0
> [26,]    9    0
> [27,]    3    0
> [28,]    3    0
> [29,]   15    1
> [30,]    5    1
> [31,]    4    0
> [32,]    5    1
> [33,]    5    1
> [34,]    5    1
> [35,]    4    0
> [36,]    8    0
> [37,]    1    0
> [38,]   15    0
> [39,]    3    0
> [40,]    3    0
> [41,]    1    0
> [42,]    6    0
> [43,]    3    0
> [44,]    6    0
> [45,]    3    0
> [46,]    4    0
> [47,]    5    0
> [48,]   14    0
> [49,]    4    0
>
>
>
>
>
> Q1. Column one is the data set, and column two is an indicator of 1 and 0.
> Some values
>          in column one corresponding to indicator 1 in column two are
> different, and some
>          are the same. There are 5 different groups of values in column one
> with indicator 1
>          in column two.
>
> (a) How I can choose only one value (only one observation) from each of
> these groups to
>      develop a vector of length 5 as: (1   2    5   10  15).
>
>
>
>
> (b) How I can find number of observations in each of these groups as a
> vector as:
>         (2     2    5    4   1).
>
>
>
>
>
>
>
>
>
>
>
> These are the values with indicator 1.
>
>     [,1] [,2]
>  [1,]    1    1
>  [2,]    1    1
>  [3,]    2    1
>  [4,]    2    1
>  [5,]    5    1
>  [6,]    5    1
>  [7,]    5    1
>  [8,]    5    1
>  [9,]    5    1
> [10,]   10    1
> [11,]   10    1
> [12,]   10    1
> [13,]   10    1
> [14,]   15    1
>
> =====================
>
>
>
>
>
> ==========================
> AbouEl-Makarim Aboueissa, Ph.D.
> Assistant Professor of Statistics
> Department of Mathematics & Statistics
> University of Southern Maine
> 96 Falmouth Street
> P.O. Box 9300
> Portland, ME 04104-9300
>
> Tel: (207) 228-8389
> Fax: (207) 780-5607
> Email: aaboueissa at usm.maine.edu
>           aboueiss at yahoo.com
> Office: 301C Payson Smith
>
>
>


-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O