How To Calculate Patient Level F1 Score?

Define the patient-level prediction for each patient as positive or negative

Define the patient-level ground truth for each patient as positive or negative

Count true positives as patients predicted positive and actually positive

Count false positives as patients predicted positive but actually negative

Count false negatives as patients predicted negative but actually positive

Compute precision as TP / (TP + FP)

Compute recall as TP / (TP + FN)

Compute F1 score as 2 × (precision × recall) / (precision + recall)

Use the patient-level TP, FP, and FN counts in the formula

If precision + recall equals 0, set F1 to 0