The reliability of data may be determined either by correlating odd-even frequencies of speech sounds or by the method of the percent of agreement of the items. In the following both methods will be applied to a sample of the speech sounds of infants. The sample upon which the analyses are based are sixty records of infant speech sounds from a total of over a thousand records from the first to the thirtieth month of life. Two records per month were selected randomly by means of a table of random numbers. In this sample 13 vowel and 26 consonant sounds were found.
Proceedings of the Iowa Academy of Science
©1945 Iowa Academy of Science, Inc.
Irwin, Orvis C.
"The Chen Index Applied to the Speech Sounds of the Fifth Half Year of Life,"
Proceedings of the Iowa Academy of Science, 52(1), 254-254.
Available at: https://scholarworks.uni.edu/pias/vol52/iss1/33