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Questions and Answers

What is the Elbow point in an Elbow plot?

The point where each point is in a separate cluster.

The point where all points are in one cluster.

The point where WCSS rapidly changes, creating an elbow shape (correct)

The point where WCSS starts to move almost parallel to the X-axis.

What is the main issue when we do not know K in K-means algorithm?

Need to determine the number of iterations

Need to determine the cost function

Need to determine the optimum clustering (correct)

Need to determine the number of clusters

What is the significance of the Elbow point in the Elbow plot?

It marks the highest value of WCSS.

It marks the point where the WCSS starts to increase rapidly.

It marks the point where WCSS starts to move almost parallel to the X-axis. (correct)

It indicates the lowest value of K.

What is the optimal K value in an Elbow plot?

The K value corresponding to the Elbow point. Signup and view all the answers

What is the best method to determine the optimum value of K?

Elbow plot/method Signup and view all the answers

What happens when K=N in the Elbow plot?

Each point is in a separate cluster. Signup and view all the answers

What is the cost function for each clustering in K-means algorithm?

Determining the sum of squared distances Signup and view all the answers

At what value of K is the WCSS the largest in the Elbow plot?

K=1 Signup and view all the answers

What happens to WCSS as K increases in an Elbow plot?

WCSS decreases. Signup and view all the answers

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