Subsetting your data before graphing
Of course, you can subset before creating your graph. Let's subset T
to include only females over 165 cm and then graph the height against weight. We use the subset()
command and the logical operator &
.
TF <- subset(T, GENDER == "F" & HEIGHT > 165) TF
The dataset you get is as follows:
Now let's create a graph of height against weight for this smaller dataset using the following syntax:
qplot(HEIGHT, WEIGHT_1, data = TF, geom = c("point"), xlab = "HEIGHT", ylab = "WEIGHT")
Here is our graph:
As an exercise, you can create another scatterplot that is similar to the preceding scatterplot, again using the argument geom = "point"
. Enter the following syntax and create the graph for yourself:
qplot(HEIGHT, WEIGHT_1, data = T, geom = "point", xlab = "HEIGHT (cm)", ylab = "WEIGHT BEFORE TREATMENT (kg)" , color = I("red"), size = I(3))