indicating whether or not the teacher had a break in service for two or more

# Indicating whether or not the teacher had a break in

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, indicating whether or not the teacher had a break in service for two or more years (TRUE/FALSE). You are going to explore how these variables affect teacher pay. (i) Make a plot of salary versus the number of months in service using color, or otherwise, to indicate the sex of each teacher on the plot. Comment on what you see, and why the authors of the original article published using with this data may have titled their paper “Sex differentials in teachers’ pay” (Turnbull & Williams; JRSSA 1974). (ii) Next, ignoring the factor months and produce six sets of boxplots, one set for each other factor ( sex , marry , degree , type , train , and break ), showing the conditional distribution of salary for each level of each factor. Which seems to have the strongest effect on teacher salary? What evidence do you use to conclude this. (iii) Using color, or otherwise, plot salary versus months in service [similar to (i)] with indications for the levels your chosen factor [from (ii)] for each teacher (for instance using color or shapes for the points). How does this new plot compare with the plot from (i)? What do you conclude based on this new evidence? (iv) EC: Construct a plot of salary versus months in service [similar to (i)] indicating BOTH the levels your chosen factor [from (ii)] for each teacher AND sex concurrently in a single plot. Does this give you any further insight into why you may see differences in salary? 1 Male teachers are coded as “single” (FALSE) whether they were married or not. 1

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• Spring '14

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