I don't understand the results
To complete the title, I'm a newbe on this fabulous website but english isn't my native language so I don't undertstand my results.
For n-back settings : for the moment I have 0.65 for downgrade threshold and 0.8 for upgrade threshold. What does it mean ? There is a sentence near these results but I don't understand the meaning.
For the graph under these figures, what is the blue line ? The average of scores ?
Under, we have a chart, what is % difference and Z-score ? How to interpret them ?
Thank you for your help !
It's a really good job !
For n-back settings : for the moment I have 0.65 for downgrade threshold and 0.8 for upgrade threshold. What does it mean ? There is a sentence near these results but I don't understand the meaning.
For the graph under these figures, what is the blue line ? The average of scores ?
Under, we have a chart, what is % difference and Z-score ? How to interpret them ?
Thank you for your help !
It's a really good job !
PELICAN | 2 years ago
Reply
If you score above the upgrade threshold, your difficulty will increase in certain tasks, like n++ for the n-back. Similarly, if you score below your downgrade threshold, your difficult will decrease.
Whoopska | 2 years ago
Reply
% difference is calculated by taking the "reference score" and your average and calculating the absolute value of the difference in scores divided by the reference. In other words, it calculates the absolute value of the difference in percent form between the two scores.
Z-score is a more interesting figure because it relates to the standard deviation and what percentile of the population your scores fall within.
As an example to demonstrate this (assuming standard deviation is 15):
A person with an IQ of 115 compared with the mean of 100 has a percent score of 15% and a z-score of 1. The z-score translates to the fact that they score above 84% percent of the population.
A person with an IQ of 130 compared with the mean of 100 has a percent score of 30% and a z-score of 2. The z-score translates to the fact that they score above 97% of the population.
From those examples, you can see that there is a significant difference between the % and the z-score in interpretation. Though both are linear (meaning that if you score for example 15 points better on a test, you've increased your % difference by 15 and your z-score by 1), the z-score reflects your position on the bell curve, which is not a linear distribution.
A good reason for both of these to be included is that there are certain tests with very high standard distributions. You may see that your reaction speed is very far away from the reference score and your percent difference is very high, but your z-score is very low. That is because the distribution of reaction speeds is very high on this site.
Z-score is a more interesting figure because it relates to the standard deviation and what percentile of the population your scores fall within.
As an example to demonstrate this (assuming standard deviation is 15):
A person with an IQ of 115 compared with the mean of 100 has a percent score of 15% and a z-score of 1. The z-score translates to the fact that they score above 84% percent of the population.
A person with an IQ of 130 compared with the mean of 100 has a percent score of 30% and a z-score of 2. The z-score translates to the fact that they score above 97% of the population.
From those examples, you can see that there is a significant difference between the % and the z-score in interpretation. Though both are linear (meaning that if you score for example 15 points better on a test, you've increased your % difference by 15 and your z-score by 1), the z-score reflects your position on the bell curve, which is not a linear distribution.
A good reason for both of these to be included is that there are certain tests with very high standard distributions. You may see that your reaction speed is very far away from the reference score and your percent difference is very high, but your z-score is very low. That is because the distribution of reaction speeds is very high on this site.
Whoopska | 2 years ago
Reply
