Estimating root word vocabulary growth in normative and advantaged populations: Evidence for a common sequence of vocabulary acquisition.

摘要: Root word vocabulary was studied in 2 normative samples (English-speaking, wide socioeconomic range) and an advantaged sample. The authors estimated that 2nd grade, the mean 5,200 root words, increasing to approximately 8,400 words by 5th grade. During grades 3-5, lowest quartile added about 3 a day, whereas highest 2.3 day. However, children had only reached average 4th-grade level because they such small There is evidence are learned roughly same order. implications of these findings suggest (a) greater efforts should be made foster acquisition primary years (b) rough curriculum sequence can identified for elementary years.