{'fraction_non_alphanumeric': 0.012195121951219513, 'fraction_numerical': 0.0, 'mean_word_length': 5.7534246575342465, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Dynamic Change in Classification Systems : A Preliminary Model for Instance-based Matching

This paper presents a preliminary mathematical model for classification systems which change over time. Capturing this dynamic change is useful in instance-based matching from older versions of a classification system to newer versions. Such mappings have practical implications for the development of historical economic time series when the classification of economic activity has undergone change.