4. Creating Graphs with ggplot | R Graph Essentials

Creating curves for each factor level

Let's see how to produce multiple curves in ggplot. We use the Children dataset (refer to the Creating multiple curves simultaneously section in Chapter 3, Mastering the qplot Function) to produce a line graph of height against age for each child. We created this particular graph in qplot and now we create it in ggplot, but we amend it a little. You can cut and paste the data directly from the code file for this chapter. Remember that the data for each child is arranged in a single column that holds six measurements of height for each child. We will include large points (size = 3) and slightly heavier lines (lwd = 1.2) using geom_point() and geom_line(), respectively. We will also map a color to the variable Child, so that both points and lines have a unique color for each child.

Finally, we impose our own color scheme using scale_color_manual():

ggplot(cheight, aes(x=Age, y=Height, color = factor(Child))) + geom_point(size = 3) +  geom_line(lwd = 0.7...

Tech Concepts

Programming languages

Tech Tools

Unlimited access to the largest independent learning library in tech of over 8,000 expert-authored tech books and videos.

Innovative learning tools, including AI book assistants, code context explainers, and text-to-speech.

50+ new titles added per month and exclusive early access to books as they are being written.

R Graph Essentials

R Graph Essentials

Overview of this book

Creating curves for each factor level

Confirmation

Buy this book with your credits?

Submit Your Feedback

Create a Free Account To Continue Reading

Sign in to activate your 7-day free access