Classification Measurments

$$\begin{array}{rl}& \text{Accuracy}=\frac{\text{Correct}}{N}\\ & \\ & \text{Percision}=\frac{\text{Correct Yes}}{\text{Predicted Yes}}\\ & \\ & \text{Recall}=\frac{\text{Correct Yes}}{\text{Actual Yes}}\\ & \\ & \text{Specificity}=\frac{\text{Correct No}}{\text{ Actual No}}\\ & \\ & \text{f-measure}=\frac{2\cdot \text{Percision}\cdot \text{Recall}}{\text{Percisoin}+\text{Recall}}\end{array}$$