Posted: Thu Nov 05, 2015 6:12 pm
Now with data
Although their methodology may be inherently flawed
Goodreads only allows ratings of 1, 2, 3, 4, or 5. Which translate to 2, 4, 6, 8, and 10 per the above. That means the "average" is a 6. IMDB uses 1 to 10, so an "average" of 5.5.
Additionally, IMDB uses a Bayesian weighted (may be misremembering the name) model that automatically gives every movie a certain # of 7 votes (thus why so many movies ratings are close to 7).
I submit the scales are not comparable.
Although their methodology may be inherently flawed
For example, moviegoers rated “The Martian” 8.2 out of 10 on IMDb, but readers gave the book by Andy Weir on which it was based 4.3 out of 5, which means the book rates 0.4 points higher when both are scored out of 10.
Goodreads only allows ratings of 1, 2, 3, 4, or 5. Which translate to 2, 4, 6, 8, and 10 per the above. That means the "average" is a 6. IMDB uses 1 to 10, so an "average" of 5.5.
Additionally, IMDB uses a Bayesian weighted (may be misremembering the name) model that automatically gives every movie a certain # of 7 votes (thus why so many movies ratings are close to 7).
I submit the scales are not comparable.