Dear all, I am new to lattice, so would appreciate anyone's help on the
questions below. I am using xyplot to plot some trend in my dataset. Using the
example dataset attached, I am trying to plot variable "y" over variable "time"
for each subject "id":
dat<-read.table("dat.txt",sep='\t',header=T,row.names=NULL)
xyplot(y ~ time, data=dat, groups=id, aspect = "fill", type = c("p", "l"),
xlab = "Time", ylab = "Y")
It appears that it just worked fine. But if I sort the "dat" first, the plot
will look somewhat different!
dat<-dat[order(dat$id, dat$time),]xyplot(y ~ time, data=dat, groups=id, aspect
= "fill", type = c("p", "l"), xlab = "Time", ylab = "Y")
Why is that? Do you need to sort the data first before using xyplot? Why xyplot
can not understand the dataset unless it is sorted first?
Thanks,
Johnid time y
107 0 6.5
107 1 5.1
107 2 4.2
112 0 5.6
107 3 6.9
112 1 4
112 2 1
119 0 7.6
112 3 4.9
119 1 5.7
120 0 7.1
203 0 7.4
120 2 2.1
203 1 6.3
123 0 6.8
203 2 3.8
119 3 6.1
123 1 3.9
123 2 3
120 3 6
203 3 7.6
207 0 5.8
207 1 3.1
123 3 5.7
209 3 3.6
208 0 4.4
130 0 5.5
131 0 6.9
133 0 5.7
134 0 5.1
209 0 4.9
128 2 2.9
128 1 4.5
130 2 5.9
131 1 6.9
133 2 2.6
133 1 5.7
403 2 3.1
403 0 4.5
128 0 4.5
134 2 2.3
207 3 4.8
130 3 4.9
207 2 2.3
130 1 3.8
131 2 3.9
133 3 3.1
134 1 2.8
209 1 4.2
208 3 2.3
208 1 5.3
208 2 0.8
128 3 4.4
131 3 6.2
209 2 5.7
134 3 4.1
403 3 2.5
119 2 2.3
120 1 3.8
403 1 3.2
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