Hi,

Subject: Using R for Multiple Regression

I am new to statistic but am interested in applying mathematical models to
solve biological problems. I have used a linear model to generate the test
data. When using this data I expect R to correctly identify the model but
that does not seem to be the case. I am certain that I am doing something
wrong but not able to figure it out.

Model:
Y = m1x1 + m2x2+ m3X3 + c

m1=5
m2=6
m3=0
c=2

Model Identified by R using lm(formula = y ~ x1 + x2 + x3)
(Intercept) 8.000e+01
x1          1.100e+01
x2                 NA
x3                 NA


The data I am using is as follows:

y x1 x2 x3
91 1 14 2
102 2 15 5
113 3 16 8
124 4 17 11
135 5 18 14
146 6 19 17
157 7 20 20
168 8 21 23
179 9 22 26
190 10 23 29

Kind regards

Dr. Ambikesh Jayal,
Department of Information Systems, Computing and Mathematics
Room 134 St John's Building
Brunel University
Uxbridge, Middlesex
UB8 3PH, UK
Website: http://sites.google.com/site/ambi1999/

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