1 / 5 If you want to convert from wide to long form with the package reshape2 you use the function:
2 / 5 Which programming languages are most popular for data science?
3 / 5 What describes data sets of the past compared to today's data sets?
4 / 5 In the past, data analysis was largely limited to whom?
5 / 5 Which command do you use to measure the strength of the relationship between two numeric variables?