title: Sample length affects the reliability of language sample measures in 3-year-olds: evidence from parent-elicited conversational samples.
abstract: OBJECTIVE
  The goal of this study was to investigate the extent to which sample length affected the reliability of total number of words (TNW), number of different words (NDW), and mean length of C-units in morphemes (MLCUm) in parent-elicited conversational samples for 3-year-olds.
  
  
  METHODS
  Participants were sixty 3-year-olds. A 22-min language sample was collected from each child during free play with the parent in the laboratory. Samples of 1, 3, 7, and 10 min were extracted from the 22-min samples. TNW, NDW, and MLCUm were computed from each shorter sample and the 22-min sample. TNW and NDW were adjusted by number of minutes for comparisons. The differences and correlations between each shorter sample cut and the 22-min sample on MLCUm and adjusted TNW and NDW were computed.
  
  
  RESULTS
  The shorter samples and the 22-min samples significantly differed in adjusted TNW and NDW, but not in MLCUm. TNW reached an acceptable reliability level (i.e., r = .90) in 7-min samples. NDW and MLCUm approached the acceptable reliability level (rs = .88) in 7-min samples and reached it in 10-min samples.
  
  
  CONCLUSIONS
  For conversational language samples with similar collection procedures, samples of 7 to 10 min are desirable for calculating TNW, NDW, and MLCUm in 3-year-olds.
authors.forename: Ling-Yu
authors.initials: LY
authors.lastname: Guo
authors.forename: Sarita
authors.initials: S
authors.lastname: Eisenberg
mesh_terms: D002663:Child Language; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007807:Language Tests; D008297:Male; D010290:Parents; D010988:Play and Playthings; D015203:Reproducibility of Results; D013997:Time Factors