Let's take a step back and summarize.
The "Dunning-Kruger effect" states that the less people know about something, the greater they overestimate their knowledge of that thing. Here's their own words:
…people who lack the knowledge or wisdom to perform well are often unaware of this fact. We attribute this lack of awareness to a deficit in metacognitive skill. That is, the same incompetence that leads them to make wrong choices also deprives them of the savvy necessary to recognize competence, be it their own or anyone else’s.
This has been debunked. The method used to produce their results was flawed. This has been graphically demonstrated (both literally and figuratively) by showing that completely random data will produce the same result.
However this does not mean that people have no biases towards over or under estimation of their abilities. Various papers that have looked into this using valid methods for measuring over and under estimation. While they have found no effects of the size originally reported by Dunning and Kruger, they have found that:
The "Dunning-Kruger effect" states that the less people know about something, the greater they overestimate their knowledge of that thing. Here's their own words:
…people who lack the knowledge or wisdom to perform well are often unaware of this fact. We attribute this lack of awareness to a deficit in metacognitive skill. That is, the same incompetence that leads them to make wrong choices also deprives them of the savvy necessary to recognize competence, be it their own or anyone else’s.
This has been debunked. The method used to produce their results was flawed. This has been graphically demonstrated (both literally and figuratively) by showing that completely random data will produce the same result.
However this does not mean that people have no biases towards over or under estimation of their abilities. Various papers that have looked into this using valid methods for measuring over and under estimation. While they have found no effects of the size originally reported by Dunning and Kruger, they have found that:
- everyone overestimates their ability to a small extent on general knowledge or skills tasks
- everyone slightly underestimates their ability on complex knowledge or skills tasks
- men overestimate their knowledge or ability regardless of skill level by a moderate amount
- women very slightly underestimate their knowledge or ability regardless of skill level
- Dunning-Kruger does exist, but at a much lower level, i.e. only small overestimation by the unskilled and a very slight underestimation by the highly skilled
- the greater the knowledge, the lesser the amount of error in estimating that knowledge