This exercise is optional.


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1- In the do-file called, if you want to make 5, 10, 15 charts instead of 37, what change or changes would you have to make to the code to make it interactive?



2 - Write one Stata program that converts inches to centimeters and miles to kilometers



3 - Using the file cnv.dta (click here to get it) and assuming that years are companies, write a do-file that does the following:


1.                      Creates and closes a log file for the output you get

2.                      Creates the program coefdev that estimates the coefficient of deviation of population, imports and exports for each country

3.                      Generates a summary report for each country.