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# In this exercise, we are going to vizualize the changes in US births between 1978 and 2015.

INSTRUCTIONS TO CANDIDATES

In this exercise, we are going to vizualize the changes in US births between 1978 and 2015. The data are availables in the package mozaic.

1. Install the package mosaic and load it into your R script

2. Check for each data frame Births78 and Births2015 what are the numbers of observations and variables composing it, and also the format of each variables.

3. Combine the data frames Births78 and Births2015 in such a way that the number of columns in the combined data frames is the same than in the individual data frame. Assign the combined data frame to a variable named USBirths78vs2015.

4. What are the name of the variables in the USBirths78vs2015?

5. How many rows and columns does have USBirths78vs2015?

6. Plot a scatterplot of number of births per year day split by year (see the graph Figure 2). textitTip1: transform the variable year into a factor before performing the plot. Tip2: to choose your own colors, look at how to use scale_color_manual()

7. Create a new variable positionInWeek in the data frame USBirths78vs2015, that takes the value Weekend if the birth has occurred on a Sunday or a Saturday, and the value Working day otherwise. Tips: you can use a ifelse in your recode the factor

8. Plot a bar chart that shows for each year the number of births, split by positionInWeek. See the graph Figure 3 for the expected output.

9. Plot a jitter-plot plotting for each month the numbers of births, split by position in the week, and divided by year. See the graph Figure 4 for the expected output. Tip: use the function facet_grid(), and the function theme() to change the direction of the labels on the x-axe

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