Psychometric properties of FVMC (Guo et al., 2019) GuoLing-Yu EisenbergSarita SchneiderPhyllis SpencerLinda 2019 <div><div><b>Purpose: </b>The purpose of this study was to provide reference data and evaluate the psychometric properties for the finite verb morphology composite (FVMC) measure in children between 4 and 9 years of age from the database of the Edmonton Narrative Norms Instrument (ENNI; Schneider, Dubé, & Hayward, 2005).</div><div><b>Method: </b>Participants included 377 children between age 4 and age 9, including 300 children with typical language and 77 children with language impairment (LI). Narrative samples were collected using a story generation task. FVMC scores were computed from the samples. Split-half reliability, concurrent criterion validity, and diagnostic accuracy for FVMC were further evaluated.</div><div><b>Results: </b>Children's performance on FVMC increased significantly between age 4 and age 9 in the typical language and LI groups. Moreover, the correlation coefficients for the split-half reliability and concurrent criterion validity of FVMC were medium to large (<i>r</i>s ≥ .429, <i>p</i>s < .001) at each age level. The diagnostic accuracy of FVMC was good or acceptable from age 4 to age 7, but it dropped to a poor level at age 8 and age 9.</div><div><b>Conclusion: </b>With the empirical evidence, FVMC is appropriate for identifying children with LI between age 4 and age 7. The reference data of FVMC could also be used for monitoring treatment progress.</div><div><b><br></b></div><div><b>Supplemental Material S1. </b>Description of the stories in the ENNI protocol. </div><div><br></div><div><b>Supplemental Material S2. </b>Computation of the finite verb morphology composite (FVMC). </div><div><br></div><div><b>Supplemental Material S3.</b> Example of a receiver operating characteristic (ROC) curve analysis. </div><div><br></div><div><b>Supplemental Material S4. </b><i>F</i> values, <i>p</i> values, and effect sizes (<i>d</i>) for the group differences in total number of C-units, mean length of C-units in morphemes (MLCUm), number of different words (NDW), and number of obligatory contexts for the FVMC analysis (# of OC for FVMC) by age.</div><div><br></div><div><b>Supplemental Material S5.</b> <i>Z</i> score and confidence interval calculation table for FVMC. </div><div><br></div><div>Guo, L.-Y., Eisenberg, S., Schneider, P., & Spencer, L. (2019). Finite verb morphology composite between age 4 and age 9 for the Edmonton Narrative Norms Instrument: Reference data and psychometric properties. <i>Language, Speech, and Hearing Services in Schools, 51</i>(1)<i>, </i>128-143. https://doi.org/10.1044/2019_LSHSS-19-0028</div></div>