"Examining the arc of 100,000 stories": object 'decile' not found

[tompollard]

I enjoyed your post on "Examining the arc of 100,000 stories" - thanks! For me the associated RMarkdown file raises the following error:

Line 204: Error in FUN(X[[i]], ...) : object 'decile' not found

It looks like this is a result of joining two tables containing the same decile column name.