Scientists determined what they say is the most influential movie of all time, and it’s the 1939 classic “The Wizard of Oz.” The Judy Garland chestnut came in at No. 1 using a system of algorithms based on a movie’s impact and not on its box office, The New York Post reports.

The film’s “influence score” has to do with how many times it was referenced in subsequent movies. “The Wizard of Oz” was followed on the list by “Star Wars,” “Psycho” and the original 1933 version of “King Kong.”

“Experts at the University of Turin, Italy, looked at 47,000 films listed in IMDb, the Internet movie database,” the report notes. “‘The Wizard of Oz’ was nominated for four Oscars in 1940, and won two. It was beaten to the Best Picture gong by ‘Gone With The Wind,’ which came 19th on the scientists’ list.”

The report notes that all of the movies in the top 20 were produced before 1980.

“When applied to actors, the same analysis ranked Samuel L. Jackson, Clint Eastwood and Tom Cruise as the top three. Arnold Schwarzenegger, Harrison Ford and Johnny Depp also featured in the top 20,” The Post reports. “There was only one woman in the top ten — Lois Maxwell, who played Miss Moneypenny in the James Bond movies.”

Newsweek has published the list of the top 20 movies, along with the top 10 directors, actors and actresses, which you can see by clicking here.