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How to reshape a dataframe from wide to long or long to wide format

How to reshape a dataframe from wide to long or long to wide format

Reshaping a dataframe / table from long to wide format or wide to long format is one of the daily tasks a Data Analyst / Data Scientist would be doing. The long format is similar to the tidy format that the tidyverse advocates. Even while, it’s been a very common task - the tidyr package’s solution of using spread()...

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