Information Technology Reference
In-Depth Information
X4
X6
X7
X8
0
0
40000
200
1.1
5
30000
300
1.05
5500
20000
10
6000
400
1
10000
15
6500
0
0
500
2
0
0.95
33.5
33
32.5
X1
7000
32
Group 1; n = 55
Group 2; n = 96
Group 3; n = 39
25
Group 4; n = 210
Group 5; n = 97
600
0.9
X3
7500
X5
X2
0
5
10
15
20
25
30
Figure 4.19
Two-dimensional CVA biplot of the copper froth data together with a
density surface constructed from all the sample points regardless of their group mem-
bership. Class means and 0.95-bags are also shown. The origin has been interactively
translated to a more convenient position.
ability with the education data set described by Van der Berg
et al.
(2002). This data set
is available as the R dataframe
Education.data
and consists of measurements made
in 1993 and again in 2006 for a sample of teenagers in the age group 13 - 18 years with
respect to the following variables:
TScore
total score on a Literacy Assessment Module where the level of the
tests was set approximately to Grade 7 or age 12, providing a
measure of educational attainment to complement the number of
years of formal education completed (unfortunately this variable was
not available in the 2006 survey);
EducY
number of years of education completed by the respondent;
Age
age of the respondent;
PcExpD
decile of the monthly expenditure per household member;
