I am receiving an error message from the by function that I don't understand:
Error in tapply(response, list(x.factor, trace.factor), fun) :
argument "trace.factor" is missing, with no default
My code follows:
> summary(ipd)
group values time subjects weaned disp
1:55 Min. :0.0000 Min. :0 Min. :115.0 1:65 2:45
2:35 1st Qu.:0.1950 1st Qu.:1 1st Qu.:121.0 2:25 3: 5
Median :0.3400 Median :2 Median :126.0 4:20
Mean :0.3479 Mean :2 Mean :127.6 5:20
3rd Qu.:0.5000 3rd Qu.:3 3rd Qu.:134.0
Max. :0.7300 Max. :4 Max. :144.0
NA's :48
> by(ipd[,c("time","subjects","values")],ipd[,"group"],interaction.plot)
Error in tapply(response, list(x.factor, trace.factor), fun) :
argument "trace.factor" is missing, with no default
These are my data.
> ipd
group values time subjects weaned disp
1 1 0.00 0 115 1 2
2 1 0.00 1 115 1 2
3 1 0.18 2 115 1 2
4 1 0.17 3 115 1 2
5 1 NA 4 115 1 2
6 1 0.62 0 116 1 2
7 1 NA 1 116 1 2
8 1 NA 2 116 1 2
9 1 NA 3 116 1 2
10 1 NA 4 116 1 2
11 1 0.00 0 118 1 2
12 1 0.21 1 118 1 2
13 1 0.34 2 118 1 2
14 1 0.49 3 118 1 2
15 1 NA 4 118 1 2
16 2 0.52 0 119 2 4
17 2 NA 1 119 2 4
18 2 NA 2 119 2 4
19 2 NA 3 119 2 4
20 2 NA 4 119 2 4
21 2 0.35 0 121 2 3
22 2 0.53 1 121 2 3
23 2 0.35 2 121 2 3
24 2 0.44 3 121 2 3
25 2 0.56 4 121 2 3
26 1 0.16 0 122 1 5
27 1 0.22 1 122 1 5
28 1 NA 2 122 1 5
29 1 NA 3 122 1 5
30 1 NA 4 122 1 5
31 1 0.19 0 123 2 5
32 1 NA 1 123 2 5
33 1 NA 2 123 2 5
34 1 NA 3 123 2 5
35 1 NA 4 123 2 5
36 2 0.29 0 124 1 4
37 2 0.22 1 124 1 4
38 2 NA 2 124 1 4
39 2 NA 3 124 1 4
40 2 NA 4 124 1 4
41 1 0.38 0 125 1 4
42 1 0.45 1 125 1 4
43 1 NA 2 125 1 4
44 1 NA 3 125 1 4
45 1 NA 4 125 1 4
46 1 0.22 0 127 1 2
47 1 0.37 1 127 1 2
48 1 0.28 2 127 1 2
49 1 0.50 3 127 1 2
50 1 NA 4 127 1 2
51 1 0.30 0 130 1 2
52 1 0.49 1 130 1 2
53 1 NA 2 130 1 2
54 1 NA 3 130 1 2
55 1 NA 4 130 1 2
56 1 0.70 0 131 1 2
57 1 NA 1 131 1 2
58 1 NA 2 131 1 2
59 1 NA 3 131 1 2
60 1 NA 4 131 1 2
61 2 0.00 0 133 1 2
62 2 0.50 1 133 1 2
63 2 0.56 2 133 1 2
64 2 0.73 3 133 1 2
65 2 NA 4 133 1 2
66 1 0.22 0 134 1 2
67 1 0.65 1 134 1 2
68 1 NA 2 134 1 2
69 1 NA 3 134 1 2
70 1 NA 4 134 1 2
71 2 0.34 0 135 1 2
72 2 0.73 1 135 1 2
73 2 0.71 2 135 1 2
74 2 NA 3 135 1 2
75 2 NA 4 135 1 2
76 2 0.26 0 139 2 5
77 2 NA 1 139 2 5
78 2 NA 2 139 2 5
79 2 NA 3 139 2 5
80 2 NA 4 139 2 5
81 1 0.00 0 140 1 5
82 1 0.19 1 140 1 5
83 1 NA 2 140 1 5
84 1 NA 3 140 1 5
85 1 NA 4 140 1 5
86 2 0.19 0 144 2 4
87 2 NA 1 144 2 4
88 2 NA 2 144 2 4
89 2 NA 3 144 2 4
90 2 NA 4 144 2 4
John David Sorkin M.D., Ph.D.
Professor of Medicine
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology and Geriatric
Medicine
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)
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John David Sorkin M.D., Ph.D.
Professor of Medicine
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology and Geriatric
Medicine
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)
John David Sorkin M.D., Ph.D.
Professor of Medicine
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology and Geriatric
Medicine
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)
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