The higher your quality score is, the better. As a reminder, the quality score graph is split into 3 different sections, which helps you easily identify whether or not your data is good quality. You’ll see that above 30 is colored green, 20-30 is yellow and anything below 20 is red.
These numbers represent the probability of error. A quality score of 10 means that there’s a 10% chance that the base is incorrect, while 40 means that there’s only a 0.01% probability of error. Remember, we're working with logs here.
Probability of error:
10: 10%
20: 1%
30: 0.1%
40: .01%
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