Data display in R for repeated measurements
Data display in R for repeated measurements
Graphical display of the data can be perform using the graphics package (e.g. plot function, boxplot function). However for constructing complex graphics that typically arise when dealing with repeated measurement other packages may be more convenients. Two packages will be used during this course:
? the lattice package: it is invoqued when using the plot functions from the nlme or lmer package.
? the ggplot2 package: it implements a specific grammar for bulding graphics. Once familiar with this grammar, you can produce nice and flexible displays of your data. However, this grammar may be not straightforward to understand/use at first sight and won't be explayed here. If you are interested, you can easily find tutorials on internet or look at the book (Wickham 2009).
Data set:
str(dtL.data)
## Classes data.table and data.frame : 80 obs. of 6 variables:
## $ Id
: Factor w/ 50 levels "1","2","3","4",..: 1 2 3 4 5 6 7 8 9 10 ...
## $ Gender : Factor w/ 2 levels "Female","Male": 2 2 1 1 1 1 2 2 2 2 ...
## $ Treatment: Factor w/ 2 levels "No","Yes": 2 2 2 1 1 2 1 1 1 2 ...
## $ Age
: num 1.216 0.331 1.39 0.872 -1.081 ...
## $ time
: Factor w/ 4 levels "time1","time2",..: 1 1 1 1 1 1 1 1 1 1 ...
## $ outcome : num 1.22 1.23 5.29 8.87 3.95 ...
## - attr(*, ".internal.selfref")=
1
lattice
Data display
library(lattice) xyplot(outcome ~ time, data = dtL.data)
outcome
15 10
5 0
time1
time2
time
time3
time4
2
xyplot(outcome ~ time, group = Id, data = dtL.data, type = "b")
outcome
15 10
5 0
time1
time2
time
time3
time4
3
xyplot(outcome ~ time | Treatment, data = dtL.data)
No
15
time1
time2 time3
Yes
time4
10
outcome
5
0
time1
time2
time3
time4
time
4
xyplot(outcome ~ time | Treatment, group = Id, data = dtL.data, type = "b")
No
15
time1
time2 time3
Yes
time4
10
outcome
5
0
time1
time2
time3
time4
time
5
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