[R] Problems with lm()
Andrew Robinson
A.Robinson at ms.unimelb.edu.au
Thu Jun 19 10:49:00 CEST 2008
In your data, subject is nested within sequence. Was that your
intention?
> a<-c(1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13,14,14)
> b<-c(1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2)
> c<-c(2,1,1,2,2,1,1,2,2,1,1,2,2,1,1,2,2,1,1,2,2,1,1,2,2,1,1,2)
> d<-c(2,2,1,1,2,2,1,1,2,2,1,1,2,2,1,1,2,2,1,1,2,2,1,1,2,2,1,1)
> e<-c(1739,1633,1481,1837,1780,2073,1374,1629,1555,1385,1756,1522,1566,1643,
+ 1939,1615,1475,1759,1388,1483,1127,1682,1542,1247,1235,1605,1598,1718
+ )
> Data<-data.frame(subject=as.factor(a),
+ drug=as.factor(b), period=as.factor(c),
+ sequence=as.factor(d), Max=e)
> Data
subject drug period sequence Max
1 1 1 2 2 1739
2 1 2 1 2 1633
3 2 1 1 1 1481
4 2 2 2 1 1837
5 3 1 2 2 1780
6 3 2 1 2 2073
7 4 1 1 1 1374
8 4 2 2 1 1629
9 5 1 2 2 1555
10 5 2 1 2 1385
11 6 1 1 1 1756
12 6 2 2 1 1522
13 7 1 2 2 1566
14 7 2 1 2 1643
15 8 1 1 1 1939
16 8 2 2 1 1615
17 9 1 2 2 1475
18 9 2 1 2 1759
19 10 1 1 1 1388
20 10 2 2 1 1483
21 11 1 2 2 1127
22 11 2 1 2 1682
23 12 1 1 1 1542
24 12 2 2 1 1247
25 13 1 2 2 1235
26 13 2 1 2 1605
27 14 1 1 1 1598
28 14 2 2 1 1718
Andrew
On Thu, Jun 19, 2008 at 04:29:16PM +0800, leeznar wrote:
> Dear R-users:
>
> I am a new R-user and I have a question about lm
> function. Here is my data.
> a<-c(1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13,14,14)
> b<-c(1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2)
> c<-c(2,1,1,2,2,1,1,2,2,1,1,2,2,1,1,2,2,1,1,2,2,1,1,2,2,1,1,2)
> d<-c(2,2,1,1,2,2,1,1,2,2,1,1,2,2,1,1,2,2,1,1,2,2,1,1,2,2,1,1)
> e<-c(1739,1633,1481,1837,1780,2073,1374,1629,1555,1385,1756,1522,1566,1643,1939,1615,1475,1759,1388,1483,1127,1682,1542,1247,1235,1605,1598,1718
> )
> Data<-data.frame(subject=as.factor(a),
> drug=as.factor(b), period=as.factor(c),
> sequence=as.factor(d), Max=e)
>
> lm3<- lm(Max ~subject*sequence + sequence + period +
> drug, data=Data)
> print(lm3)
> anova(lm3)
>
> When I use lm to fit the data, there are some problems
> in ??subject*sequence??. I have use GLM in SPSS to
> fit the same data, and it seems there is no problem.
>
> I don??t know where my problem is. How can I get the
> same result with SPSS? How can I do?
>
> Best regards,
> Hsin-Ya Lee
>
>
>
>
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--
Andrew Robinson
Department of Mathematics and Statistics Tel: +61-3-8344-6410
University of Melbourne, VIC 3010 Australia Fax: +61-3-8344-4599
http://www.ms.unimelb.edu.au/~andrewpr
http://blogs.mbs.edu/fishing-in-the-bay/
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