For example, when the measurement of wpm is used, it is not possible to say if the median (Mdn) utterance speed for "Okay" at 156.9 wpm was really spoken at half the intentional speed of "Got you" at 372.7 wpm.
by comparing the utterance duration of the subject and the duration of the TTS output, both utterances can be indicated with a more reasonable median (Mdn) speech rate value and say that "Got you" at 42.6% was spoken with a slightly faster speech rate than "Okay" at 33.29%, but not twice as fast as the wpm value would lead one to believe.