ITS836 Assignment 1: Data Analysis in R 1) Read the income dataset, zipIncomeAssignment.csv, into R. (You can find the csv file in iLearn under the Content -> Week 2 folder.) 2) Change the column names of your data frame so that zcta becomes zipCode and meanhouseholdincome becomes income . 3) Analyze the summary of your data. What are the mean and median average incomes? 4) Plot a scatter plot of the data. Although this graph is not too informative, do you see any outlier values? If so, what are they? 5) In order to omit outliers, create a subset of the data so that: $7,000 < income < $200,000 (or in R syntax , income > 7000 & income < 200000) 6) Whats your new mean? 7) Create a simple box plot of your data. Be sure to add a title and label the axes. HINT: Take a look at: https://www.tutorialspoint.com/r/r_boxplots.htm (specifically, Creating the Boxplot.) Instead of mpg ~ cyl, you want to use income ~ zipCode. In the box plot you created, notice that all of the income data is pushed towards the bottom of the graph because most average incomes tend to be low. Create a new box plot where the y-axis uses a log scale. Be sure to add a title and label the axes. For the next 2 questions, use the ggplot library in R, which enables you to create graphs with several different types of plots layered over each other. 8) Make a ggplot that consists of just a scatter plot using the function geom_point() with position = jitter so that the data points are grouped by zip code. Be sure to use ggplot s function for taking the log10 of the y-axis data. (Hint: for geom_point , have alpha =0.2). 9) Create a new ggplot by adding a box plot layer to your previous graph. To do this, add the ggplot function geom_boxplot() . Also, add color to the scatter plot so that data points between different zip codes are different colors. Be sure to label the axes and add a title to the graph. (Hint: for geom_boxplot , have alpha =0.1 and outlier.size =0). 10) What can you conclude from this data analysis/visualization?
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