Here's an article with a lot of facts on women directors involved with the Sundance Film Festival (indie movies).
Study on Women Directors
-Out of over 11,000 directors, writers, producers, editors, cinematographers, that were involved with making movies shown at the festival in the last 10 years, slightly under 30% were women.
-Films directed by a woman have an average of 21% more female movie makers involved with them than movies directed by a man. Women are also more likely to make documentaries than narratives.
-Slightly under 24% of movies in the film festival in the last 10 years were women, compared to only 4.4% of the top 100 box office grossing movies (as in, generally not indie) each year over the same period. In major hollywood productions, there is about a 15:1 ratio of male and female directors. So, as the budgets get larger, as it takes more networking to get in, the participation from women decreases substantially, in what was labeled by one as "a steep fiscal cliff" for women directors. Women directors are there, especially for indie films, but once we're talking about movies with major budgets, hierarchies in companies, and that sort of thing, it's almost all men.
-There hasn't been any statistical improvement for women in the last 10 years, according to the study. The ratios today are largely the same as they were a decade ago.
The study polled a lot of the women involved with film-making and asked them about what the challenges are in getting bigger roles, and the article includes their answers.