Accuracy, recall and F-values

The correct rate, recall rate and F value are the important evaluation indexes of the target in the mixed environment.

Consider the definition of these indicators first:

Correct rate = number of individuals correctly identified/number of individuals identified

Recall rate = Number of individuals correctly identified/total number of individuals present in the test set

F value = correct rate * Recall rate * 2/(correct rate + recall rate)

Example: There are 1400 carp, 300 shrimp and 300 turtles in a pond. Now for the purpose of catching carp. Seaeagle a large net, caught 700 carp, 200 shrimp, 100 turtles. So, these indicators are as follows:

Correct rate = 700/(700 + 200 + 100) = 70%

Recall rate = 700/1400 = 50%

F value = 70% * 50% * 2/(70% + 50%) = 58.3%

Let's see if seaeagle clean sweep all the carp, shrimp and turtles in the pond, and how these indicators change:

Correct rate = 1400/(1400 + 300 + 300) = 70%

Recall rate = 1400/1400 = 100%

F value = 70% * 100% * 2/(70% + 100%) = 82.35%

It can be seen that the correct rate is the proportion of the target achievement in the results of the capture; recall, as the name implies, is the proportion of the target category recalled from the area of concern, while the F-value is the evaluation index of the two indicators, which is used to comprehensively reflect the overall indicators.

Accuracy, recall and F-values