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The remaining 367 string types, or 625 tokens, fell into two broad categories of genuine spelling errors: standard errors, such as insertions, deletions, subtitutions and transpositions, which are the target of most spelling correction techniques; and special errors, such as run-on words and split words, which are problematic for most spelling correction techniques, and noise and backspace key problems, which may be specific to TDD equipment.
Breakdown of Special Spelling Errors Subcategory Count Percent Backspace 25 7% Noise 15 4% Run-ons 47 13% Splits 6 2%