The independent variable in our study is the method of text entry used: (1) letter-by-letter typing using the Wivik keyboard with no word prediction, (2) letter-by-letter typing augmented with word predictions produced by a basic prediction method, (3) letter-by-letter typing augmented with word predictions produced by an advanced prediction method.
while overall communication rate was significantly faster with advanced prediction, users took 0.641 seconds longer for each key press from using advanced prediction compared to entry without prediction.