What describes data sets of the past compared to today's data sets?

They were small, slow, and little diversity They provided little value They were stored in mainframes They were largely paper based

Which command do you use to measure the strength of the relationship between two numeric variables?

cor() table() mean() sd()

Where can you find a registry of add on packages for a specific field (e.g. Machine Learning, Time Series, Econometrics) ?

R Task View Stackoverflow Matlab Github

If you want to convert from wide to long form with the package reshape2 you use the function:

melt freeze subset corr

Which package do you need to run the function 'fread'?

data.table ggplot2 tidyr foreign