Graph plotting workshop I.
0. Install the Inkscape programme (download at https://inkscape.org/).
1. Import data describing lettuce varieties (lettuce.xlsx) to R
2. Create histograms of harvest days for both lettuce colours – combine them into a single two-panel
plot, remove the histogram titles
3. Fix the ranges of y-axes to the same values.
4. Try direct exporting to PowerPoint. Save the result in pdf or svg format. Open the svg file in the
Inkscape software, make some edits and save as pdf and export to png.
5. Reset the graphical parameters to single panel.
6. Create scatterplot of harvest mass ~ harvest days
7. Change the colors of the points to illustrate the leaf colour of the variety
8. Plot a facetted scatterplot with panels (facets) defined by the variety
9. Adjust point size
10. Export the graph to pdf/svg/powerpoint/word.
Graph plotting workshop II.
11. Draw a barplot showing the association between lettuce taste classes and leaf color. Draw both
stacked and dodged barplot. Try various versions of the barplot and color schemes to code the variable
levels.
12. Draw a boxplot of harvest mass ~ leaf color
13. Draw dotchart of mean harvest mass classified by leaf color, add error bars indicating standard
errors/confidence intervals
14. Generate new data frame by:
big.data<-data.frame(y=rlnorm(30000, 4, 0.5)+sample(c(1,50, 8, 100,
9, 11, 20, 40, 20), 30000, replace=T), fact=c(rep("a", 12000),
rep("b", 18000)))
15. Draw a boxplot of y ~ fact
16. Log scale the y-axis of the boxplot
17. Draw a beanplot of y ~ fact; examine scaling of the y-axis and then try both linear and log-scaled
axis scaling
Homework (to be completed after the second graph plotting workshop): Create a graphically nice
plot with nice axis labels – embed it into a word document with the code used to generate the figure
pasted below. Convert the word file to pdf named surname.pdf and upload to Homework Vaults in IS.
You can use your own real data or generate some imaginary data for this task.