[R] Learning ANOVA

[Stephen Liu]

Hi folks,

R on Ubuntu 10.04 64 bit.

Performed following steps on R:-

### to access to the object
> data(InsectSprays)

### create a .csv file
> write.csv(InsectSprays, "InsectSpraysCopy.csv")


On another terminal
$ sudo updatedb
$ locate InsectSpraysCopy.csv
/home/userA/InsectSpraysCopy.csv


### Read in some data
> test01 <- read.csv(file.choose(), header=TRUE)

Enter file name: /home/userA/InsectSpraysCopy.csv


### Look at the data
> test01
    X count spray
1   1    10     A
2   2     7     A
3   3    20     A
4   4    14     A
5   5    14     A
6   6    12     A
7   7    10     A
8   8    23     A
9   9    17     A
10 10    20     A
11 11    14     A
12 12    13     A
13 13    11     B
14 14    17     B
15 15    21     B
16 16    11     B
17 17    16     B
18 18    14     B
19 19    17     B
20 20    17     B
21 21    19     B
22 22    21     B
23 23     7     B
24 24    13     B
25 25     0     C
26 26     1     C
27 27     7     C
28 28     2     C
29 29     3     C
30 30     1     C
31 31     2     C
32 32     1     C
33 33     3     C
34 34     0     C
35 35     1     C
36 36     4     C
37 37     3     D
38 38     5     D
39 39    12     D
40 40     6     D
41 41     4     D
42 42     3     D
43 43     5     D
44 44     5     D
45 45     5     D
46 46     5     D
47 47     2     D
48 48     4     D
49 49     3     E
50 50     5     E
51 51     3     E
52 52     5     E
53 53     3     E
54 54     6     E
55 55     1     E
56 56     1     E
57 57     3     E
58 58     2     E
59 59     6     E
60 60     4     E
61 61    11     F
62 62     9     F
63 63    15     F
64 64    22     F
65 65    15     F
66 66    16     F
67 67    13     F
68 68    10     F
69 69    26     F
70 70    26     F
71 71    24     F
72 72    13     F


### Create a side-by-side boxplot of the data
boxplot(test01$DO ~ test01$Stream)
Error in model.frame.default(formula = test01$DO ~ test01$Stream) : 
  invalid type (NULL) for variable 'test01$DO'


I was stucked here.  Pls help.  TIA


B.R.
Stephen L



----- Original Message ----
From: Stephen Liu <satimis at yahoo.com>
To: r-help at r-project.org
Sent: Fri, August 13, 2010 11:34:31 AM
Subject: [R] Learning ANOVA

Hi folks,


File to be used is on;
data(InsectSprays)


I can't figure out where to insert it on following command;
test01 <- read.csv(fil.choose(), header=TRUE)

Please help.  TIA

B.R.




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