ISYE 6501 Exam 2 QUESTIONS WITH 100% VERIFIED SOLUTIONS LATEST UPDATE 2023/2024

ISYE 6501 Exam 2 QUESTIONS WITH 100% VERIFIED SOLUTIONS LATEST UPDATE 2023/2024 What are some of the consequences of outliers in k-means? - ANSWER It will drag the cluster center artificially to one side Because k-means is a heuristic and thus fast what can we do? - ANSWER run it several times choosing different clusters centers and choose the best one and we can choose different values of k How does bias/variance change as k changes in KNN? - ANSWER the higher the k, the higher the bias; the lower the k, the higher the variance. when k = 1, that is the most complex model and thus likely to overfit the data How do we find the best value of k in k means? - ANSWER Elbow method: we calculate the total distance of each data point to its cluster center and plot it in two dimensions. We look for the kik in the graph When clustering for prediction, how do we choose the prediction? - ANSWER When we see a new point, we just choose whichever cluster center is closest