How many morphemes should be computed for analyzing MLU?

For analyzing Mean Length of Utterance (MLU), the typical guideline is to compute the number of morphemes in a range that provides sufficient data for a reliable analysis. In the context of speech-language pathology and language development studies, examining 5 to 100 morphemes strikes a balance that allows for a sufficient assessment of a child's language abilities without overwhelming the analysis with too many utterances.

This range helps ensure that the sample is representative of the child's typical speech patterns while still being manageable for analysis. A larger sample, such as beyond 100 morphemes, might introduce variability that could complicate the assessment without significantly enhancing the understanding of the child's language development. Therefore, focusing on around 100 morphemes provides a practical and effective means for calculating MLU and discerning patterns in language acquisition.