Cluster Analysis: Evaluating K-means Clusters
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Questions and Answers

What is the most common measure for evaluating K-means clusters?

  • Mean Squared Error (MSE)
  • Root Mean Squared Error (RMSE)
  • Sum of Squared Error (SSE) (correct)
  • Mean Absolute Error (MAE)
  • How is the error calculated for each point in the context of evaluating K-means clusters?

  • The sum of distances to all clusters
  • The distance to the nearest cluster (correct)
  • The distance to the farthest cluster
  • The average distance to all clusters
  • What does SSE stand for in the context of evaluating K-means clusters?

  • Squared Sum of Errors
  • Standard Squared Error
  • Sum of Squared Error (correct)
  • Sum of Summed Error
  • What does a general trend indicate about SSE as the number of clusters (K) increases in K-means clustering?

    <p>SSE tends to decrease</p> Signup and view all the answers

    Why is a lower SSE or higher K not always better in K-means clustering?

    <p>It can lead to overfitting</p> Signup and view all the answers

    What is the benefit of using the technique of 'Multiple Runs' for solving the initial centroids problem in K-means clustering?

    <p>It avoids poor initial placements and increases the chance of finding a better clustering solution.</p> Signup and view all the answers

    Which approach uses hierarchical clustering to create a dendrogram and then pick initial centroids based on it?

    <p>Hierarchical Clustering for Initial Centroids</p> Signup and view all the answers

    What is the importance of choosing initial centroids in K-means clustering?

    <p>It can significantly impact the final clustering result.</p> Signup and view all the answers

    What is the technique that involves starting with a larger number of initial centroids than the final desired number of clusters, and gradually reducing the number of centroids to K by combining them based on proximity or similarity?

    <p>Selecting More Than K Initial Centroids</p> Signup and view all the answers

    What does the Elbow Method help to determine in K-means clustering?

    <p>The optimal balance between increasing K and decreasing SSE.</p> Signup and view all the answers

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