What function do you use in the caret package to determine the accuracy of your machine learning models?
What function do you use to render a data visualization in a shiny server?
What can you do with the 'by' parameter of a data.table?
Which of the following is not performed by Data Scientist ?
Where can you find a registry of add on packages for a specific field (e.g. Machine Learning, Time Series, Econometrics) ?