Accuracy Number of correct predictions to total number of samples ratio $$\frac{True\, Positives\,+\,True\, Negatives}{Total \,number\, of \,samples}$$
Precision Proportion of correct positive predictions, in relation to the total of positive predictions $$\frac{True \,Positives}{False\, Positives\,+\,True \,Positives}$$
F1 Score Harmonic mean between precision and recall $$2*\frac{1}{\frac{1}{precision}+\frac{1}{recall}}$$
True positive rate (recall or sensitivity) Proportion of correct positive predictions, in relation to all relevant samples, i.e., all positive samples $$\frac{True \,Positives}{True \,Positives\,+\,False \,Negatives}$$
False positive rate (specificity) Proportion of negative samples mistakenly predicted as positive, in relation to all negative samples $$\frac{False\, Positives}{False\, Positives\,+\,True \,Negatives}$$
False negative rate Proportion of positive samples mistakenly predicted as negative, in relation to all relevant samples, i.e., all positive samples $$\frac{False \,Negative}{False \,Negative\,+\,True \,Positive}$$ 