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: [EMAIL PROTECTED]
[EMAIL PROTECTED]
Office: 301C Payson Smith
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