This tool applies Principal Components Analysis rules to a text to generate relationships between words and text units. It works best with large texts where users can specify units of over 500 words. HTML and XML versions are not currently avaiable.

This tool’s functionality has been incorporated into Voyant available online at www.voyant-tools.org.

Text Variation Explorer (TVE) is a Java tool for text visualization. TVE enables users to explore the effect of window size on a text's type-token ratio, proportion of hapax legomena and average word length; it can also cluster text fragments based on principal component analysis and has text comparison features. TVE is in beta and is presented 'as is'.