Normalized discounted cumulative gain nDCG nDCG nDCG Discounted Cumulative Gain nDCG normalised Discounted Cumulative Gain (nDCG) nDCG nDCG Discounted Cumulative Gain DCG Normalized Discounted Cumulative Gain (NDCG) nDCG nDCG discounted cumulative gain nDCG Discounted cumulative gain DCG NDCG