Knowledge base
Articles about the tests on this site and the numbers they produce: what a score can tell you, where it stops, and what a real test does differently.
Is an online IQ test accurate? What the number does and does not tell you
An online IQ test gives you a number, but rarely an IQ. A real IQ test is normed on a large group, taken under supervision, and has a mean of 100 with a standard deviation of 15. A free test on a website usually lacks that norm group, so a score of 128 says something about the site and little about you.
Comparing brain games: what to look for before you pay
Check four things before you pay for a brain game: whether a subscription keeps renewing on its own, whether it measures something or is a pastime, what the maker does with your data, and what the score is compared with. On content per euro, Skillido is not the best choice.
Does brain training work? What the research shows, and what it does not
Research consistently shows that you get better at the task you practice. In well-designed studies that gain rarely carries over to tasks outside the training, and that carry-over is what the advertising promises. In January 2016 the US Federal Trade Commission settled with the maker of Lumosity over exactly those claims.
Are personality tests accurate? Types, traits and what a second try shows
A personality test is as accurate as the model behind it. A test that sorts you into one of sixteen types draws a line through the middle of every scale, so anyone close to that line can land on the other side the next time. A test that scores five traits puts you somewhere on each scale instead, which keeps a result from today comparable with one from next year. Neither kind sees how you behave; both record what you say about yourself.
