Literary analysis

Let's look at the book rating data again. You've been tasked with finding out more information about this data that you couldn't calculate before. You need to find the total number of ratings used to create this dataset and how old is the oldest book.

The DataFrame df_books is available in your environment.

この演習はコースの一部です

Introduction to Julia

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演習の手順

Use the sum() function to find the total of the ratings_count column.
Use the minimum() function to find the minimum value in the original_publication_year column.

実践的なインタラクティブ演習

このサンプルコードを完成させて、この演習に挑戦してみましょう。

# Find the total number of ratings
total_reviews = ____(____)

# Find the earliest publication year
earliest_year = ____(____)

println("Total number of reviews is $total_reviews")
println("Earliest year of publication is $earliest_year")

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