Mosaic Plot
Richard Palmer
10/8/2019
In this exercise you will learn to visualize the pairwise relationships between a set of quantitative variables. To this end, you will make your own note of 8.5 Mosaic plots from Data Visualization with R.
Mosaic charts can display the relationship between categorical variables using:
- rectangles whose areas represent the proportion of cases for any given combination of levels, and
- the color of the tiles to indicate the degree relationship among the variables.
The Titanic data set came from https://osf.io/aupb4/.
In the graph below,
- dark blue represents more cases than expected given independence (by chance); and
- dark red represents less cases than expected if independence holds (by chance).
Q1 Are more passengers survived?
more people died than survived
Q2 Describe the largest group that didn’t survive. Discuss by class and gender.
the males in the third class was the largest group that did not survive
Q3 Describe the largest group that did survive. Discuss by class and gender.
females in the 1st class was the largest group that did survive
Q4 Describe one group that has more cases than expected given independence (by chance). Discuss by class and gender.
the males in the third class had more cases than expected, if the males in 3rd class were in first or second they would have had a better chance also if you were a female in the first class you had a better chance of survival.
Q5 Describe one group that has less cases than expected given independence (by chance). Discuss by class and gender.
3rd class males had fewer than expected cases and first class females had less cases than expected.
Q6 Create a mosaic plot for Arthritis in the same way as above.
Hint: The Arthritis data set is from the vcd package. Add an additional argument gp = shading_max in the mosaic function. This is because the residuals are too small to have color.
Q7 Repeat Q1-Q5.
1.more patience did not improve 2.patience with the placebo had the largest group that didn’t improve 3.the group that was treated showed marked improvement 4.the group that was treated had more improvement than expected 5.the patient group that did not receive treatment showed marked improvement there was fewer cases ## Q8 Hide the messages, the code and its results on the webpage. Hint: Use message, echo and results in the chunk options. Refer to the RMarkdown Reference Guide.