1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
R version 2.5.0 Under development (unstable) (2007-03-25 r40887)
Copyright (C) 2007 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.
R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.
Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.
> library("foreign")
> df <- read.arff("contact-lenses.arff")
> summary(df)
age spectacle-prescrip astigmatism tear-prod-rate
pre-presbyopic:8 hypermetrope:12 no :12 normal :12
presbyopic :8 myope :12 yes:12 reduced:12
young :8
contact-lenses
hard: 4
none:15
soft: 5
> str(df)
'data.frame': 24 obs. of 5 variables:
$ age : Factor w/ 3 levels "pre-presbyopic",..: 3 3 3 3 3 3 3 3 1 1 ...
$ spectacle-prescrip: Factor w/ 2 levels "hypermetrope",..: 2 2 2 2 1 1 1 1 2 2 ...
$ astigmatism : Factor w/ 2 levels "no","yes": 1 1 2 2 1 1 2 2 1 1 ...
$ tear-prod-rate : Factor w/ 2 levels "normal","reduced": 2 1 2 1 2 1 2 1 2 1 ...
$ contact-lenses : Factor w/ 3 levels "hard","none",..: 2 3 2 1 2 3 2 1 2 3 ...
> q()
|
