Degree to which the output respects the reference (inflectional) morphological rules of the target language.
Metrics
Percentage of inflections correctly treated.
List of error types.
Average string edit distance per sentence or for all inflectable tokens in the text.
References
Miller and Vanni 2000
Notes
Inflections typically carry information about number, gender, case, tense,aspect, etc.
This quality is especially important for highly inflected languages.