Clustering of text collections is generally difficult due to its high dimensionality, heterogeneity, and large size. These characteristics compound the problem of determining the appropriate similarity space for clustering algorithms. Here, we propose to use the spectral analysis of the similarity space of a text collection to predict clustering behavior before actual clustering is performed. Spectral analysis is a technique that has been adopted across different domains to analyze the key encoding information of a system. Using spectral analysis for prediction is useful in first determining the quality of the similarity space and discovering any possible problems the selected feature set may present.