An on-line calculator to compute phonotactic probability and neighborhood density based on child corpora of spoken American English

. Author manuscript; available in PMC: 2010 Sep 28.

Published in final edited form as: Behav Res Methods. 2010 May;42(2):497–506. doi: 10.3758/BRM.42.2.497

Word Length in Sounds (number of words per corpus)	Positional Segment Average		Biphone Average		Neighborhood Density

	Child M	Adult M	Child M	Adult M	Child M	Adult M
	(SD)	(SD)	(SD)	(SD)	(SD)	(SD)
1	0.0082	0.0113	N/A	N/A	16.80	21.40
(n = 5 child; 5 adult)	(0.0042)	(0.0118)			(7.56)	(8.62)
2	0.0335	0.0305	0.0018	0.0015	17.29^*	22.89^*
(n = 157 child; 194 adult)	(0.0201)	(0.0170)	(0.0014)	(0.0028)	(7.18)	(8.05)
3	0.0512^*	0.0449^*	0.0040^*	0.0030^*	12.31^*	18.21^*
(n = 958 child; 1608 adult)	(0.0175)	(0.0166)	(0.0026)	(0.0026)	(6.14)	(8.47)
4	0.0545^*	0.0466^*	0.0049^*	0.0040^*	4.06^*	6.87^*
(n = 1286 child; 2899 adult)	(0.0147)	(0.0135)	(0.0027)	(0.0027)	(3.04)	(4.53)
5	0.0515^*	0.0462^*	0.0046^*	0.0042^*	0.91^*	1.78^*
(n = 943 child; 3114 adult)	(0.0139)	(0.0121)	(0.0025)	(0.0025)	(1.23)	(1.96)
6	0.0498^*	0.0474^*	0.0043	0.0046	0.22^*	0.53^*
(n = 639 child; 3039 adult)	(0.0126)	(0.0118)	(0.0022)	(0.0025)	(0.50)	(0.86)
7	0.0486	0.0483	0.0040^*	0.0049^*	0.09^*	0.25^*
(n = 442 child; 2725 adult)	(0.0112)	(0.0111)	(0.0018)	(0.0023)	(0.30)	(0.54)
8	0.0493	0.0504	0.0041^*	0.0057^*	0.05^*	0.16^*
(n = 210 child; 2202 adult)	(0.0104)	(0.0108)	(0.0017)	(0.0026)	(0.24)	(0.43)
9	0.0512	0.0521	0.0049^*	0.0069^*	0.04	0.15
(n = 117 child; 1534 adult)	(0.0101)	(0.0104)	(0.0018)	(0.0036)	(0.20)	(0.43)
10	0.0525	0.0570	0.0052^*	0.0093^*	0.09	0.12
(n = 44 child; 1019 adult)	(0.0107)	(0.0114)	(0.0018)	(0.0059)	(0.29)	(0.34)
11	0.0537	0.0564	0.0055^*	0.0082^*	0.09	0.06
(n = 23 child; 526 adult)	(0.0145)	(0.0111)	(0.0021)	(0.0043)	(0.29)	(0.24)
12	0.0708	0.0603	0.0101	0.0094	0.00	0.03
(n = 4 child; 266 adult)	(0.0103)	(0.0118)	(0.0015)	(0.0054)	(0.00)	(0.17)
13	0.0743	0.0563	0.0182^*	0.0077^*	0.00	0.00
(n = 2 child; 106 adult)	(0.0330)	(0.0108)	(0.0066)	(0.0036)	(0.00)	(0.00)
14	0.1066	0.0563	0.0324	0.0080	0.00	0.00
(n = 2 child; 37 adult)	(0.0416)	0.0113)	(0.0135)	(0.0034)	(0.00)	(0.00)
15	N/A	0.0629	N/A	0.0099	N/A	0.00
(n = 0 child; 16 adult)		(0.0114)		(0.0024)		(0.00)

All Words	0.0511^*	0.0485^*	0.0044^*	0.0051^*	4.32^*	3.23^*
(n = 4832 child; 19290 adult)	(0.0151)	(0.0129)	(0.0026)	(0.0034)	(6.16)	(6.39)

Note. Although the values were re-computed for this study, adult values match those reported in Table 2 of H. L. Storkel, 2004b, Journal of Speech, Language, and Hearing Research, 47, p 1460.

Child value differs significantly from adult, p < 0.001.