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The Ord's graph is a simple graphical method for displaying frequencydistributions of data or theoretical distributions in the two-dimensionalplane. Its coordinates are proportions of the first three moments, eitherempirical or theoretical ones. A modification of the Ord's graph based onproportions of indices of qualitative variation is presented. Such amodification makes the graph applicable also to data of categorical character.In addition, the indices are normalized with values between 0 and 1, whichenables comparing data files divided into different numbers of categories. Boththe original and the new graph are used to display grapheme frequencies ineleven Slavic languages. As the original Ord's graph requires an assignment ofnumbers to the categories, graphemes were ordered decreasingly according totheir frequencies. Data were taken from parallel corpora, i.e., we work withgrapheme frequencies from a Russian novel and its translations to ten otherSlavic languages. Then, cluster analysis is applied to the graph coordinates.While the original graph yields results which are not linguisticallyinterpretable, the modification reveals meaningful relations among thelanguages.

A data-based classification of Slavic languages: Indices of qualitative variation applied to grapheme frequencies