This extended version of the Pottermore Sorting Hat Quiz takes into account every single quiz question in order to determine your house accurately. The grading scheme that is used is exactly the same as in Pottermore
Harry Potter began as a series of seven fantasy novels by J. K. Rowling and later expanded into a multimedia franchise. Pottermore Presents, a line of eBooks which is a combination of existing Pottermore material and new information.
When i took the test (and i did multiple times) the result was always gryffindor. As a little kid i probably was the most hufflepuff, when i approached 11y more gryffindorish.
Note: When Pottermore relaunched the quiz in 2016, the question order was randomized (#6,#1-5,pets,#7), and the pet factor was no longer as subtle. The questions with four answer choices (#1,#2,#5) all functioned as one would think, with each giving one point to a corresponding to each house.
Pottermore says Slytherin, which I think is odd in a way for a Fi dom, but upon further thought, I suppose Fi values don't have to be ethical in the traditional sense of the word, that strikes me as more Fe-esque. So far, the 5 times I've taken the Pottermore sorting hat quiz I've gotten/ the frequency of house in regards to my results has been: