I'm looking for both methods for measuring efficiency of such systems, and any empirical studies which I can use as an evidence to convince investors. For example:

  • 25% of Android users use word prediction module every day.
  • Only 10% of spell correction suggestions of Android is accepted by users.

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I haven't read this paper through properly but it (or some of the references it cites) looks like it will contain the information you are looking for: The length of text messages and use of predictive text: Who uses it and how much do they have to say?


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