[R] Help needed in R

[Heinz Tuechler]

At 23:07 01.03.2008, AbouEl-Makarim Aboueissa 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).
>

table1 <- table(data[data[, 2]==1, 1])

as.numeric(dimnames(table1)[[1]])

[1]  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).
>

as.vector(table1)

[1] 2 2 5 4 1

greetings

Heinz










>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
>
>
>
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