19. The apparatus of claim 18 , wherein the obtaining the utterance in speech data, the processing the utterance to generate the interpretation of the actual word string, the processing the utterance to identify the utterance frame, and the calculating the prediction of the word accuracy are repeated for an additional utterance.
18. An apparatus for predicting a word accuracy, comprising: a processor; and a computer-readable medium in communication with the processor, storing a plurality of instructions which, when executed by the processor, cause the processor to perform operations, the operations comprising: obtaining an utterance in speech data, wherein the utterance comprises an actual word string; processing the utterance for generating an interpretation of the actual word string; processing the utterance to identify an utterance frame; and calculating a prediction of a word accuracy associated with the interpretation based on a stationary signal-to-noise ratio and a non-stationary signal-to-noise ratio, wherein the stationary signal-to-noise ratio and the non-stationary signal-to-noise ratio are determined according to a frame energy associated with the utterance frame, and wherein the calculating the prediction of the word accuracy associated with the interpretation comprises: computing the stationary signal-to-noise ratio for the utterance; computing the non-stationary signal-to-noise ratio for the utterance; and computing the prediction of the word accuracy associated with the interpretation using the stationary signal-to-noise ratio and the non-stationary signal-to-noise ratio.