Exam 20: Cluster Analysis

Nonhierarchical clustering is faster than hierarchical methods.

Which of the methods below is not a hierarchical method?

________ is a clustering procedure where each object starts out in a separate cluster.

________ are agglomerative methods of hierarchical clustering in which clusters are generated to minimize the within-cluster variance.

The ________ method is based on the maximum distance or the furthest neighbor approach.

Which of the following is a variance method of clustering?

In the TwoStep procedure,the euclidean measure can be used only when all of the variables are ordinal.

A ________ is a lower-triangle matrix containing pairwise distances between objects or cases.

In cluster analysis,objects with larger distances between them are more similar to each other than are those at smaller distances.

To use cluster analysis for clustering variables to identify homogeneous groups,the researcher could do all of the following except ________.

Most ________ methods are heuristics based on algorithms.

Which method allows the researcher to obtain information on cluster membership of cases if the number of clusters is specified?

Which of the following is not a procedure to check the quality of clustering results?

The ________ method is based on minimum distance or the nearest neighbor rule.

The centroids represent the mean values of the objects contained in the cluster on each of the variables.

Which statement is not true concerning the clustering solution if the variables are measured in vastly different units?

In hierarchical clustering,the solution may depend on the order of cases in the data set.

When cluster analysis is also used for clustering variables to identify homogeneous groups,the units used for analysis are the variables and the distance measures are computed for all pairs of variables.

Choice of a clustering method and choice of a distance measure are interrelated.

The ________ are the initial starting points in nonhierarchical clustering.