R data.table in 5 minutes

The video tutorial introduces the data table package in R, highlighting its speed and concise syntax for data wrangling. It explains how to create data tables, convert data frames, and perform operations like subsetting and calculating mean delays. The tutorial also covers aggregating data by airline and briefly touches on joining tables using a lookup table.

What is one of the main advantages of using the data.table package in R?

• It is known for its speed and concise syntax.

• It has a more complex syntax than the tidyverse.

• It only works with small datasets.

• It is slower than base R.

Which function is used to import a CSV file as a data.table in R?

• read.csv

• fread

• import.csv

• load.csv

How can you filter data in a data.table for flights from Boston to San Francisco?

• Use the 'select' function.

• Set conditions in the 'i' section.

• Apply the 'filter' function.

• Use the 'subset' function.

What is the purpose of the 'by' parameter in data.table?

• To sort the data.

• To filter rows.

• To aggregate data by groups.

• To join tables.

What is a necessary step before joining tables in data.table?

• Sorting both tables.

• Setting keys for each table.

• Converting tables to data frames.

• Removing duplicate rows.