. Author manuscript; available in PMC: 2013 Aug 12.

Published in final edited form as: J Exp Psychopathol. 2011 May 5;2(2):170–196. doi: 10.5127/jep.010910

Table 1.

Data Requirements for Taxometric Analysis

Data Characteristics	Recommended Criteria	Values for Illustrative Data Sets
Data Characteristics	Recommended Criteria	IC	ID	RC	RD
Sample size (N)	N≥300	2,000	2,000	600	600
Size of putative	n_t≥50,	1,000, .50	---	60, .10	---
taxon (n_t, P)	P≥.05	(998, .50)	(1,105, .55)	(83, .14)	(192, .32)
Number of indicators (k)	k≥2^a	6	6	4	4
	k≥5^b
Number of ordered categories (C)	C≥4	20	20	5	5
Indicator validity (d)	d≥1.25	2.00	---	1.85	---
		(2.01)	(1.62)	(2.06)	(1.54)
Within-group	r_wg≤.30	−.01	---	.22	---
correlation (r_wg)		(−.01)	(.21)	(.07)	(.07)

Notes. Values in parentheses are estimates. IC = idealized categorical data set; ID = idealized dimensional data set; RC = representative categorical data set; RD = representative dimensional data set.

This criterion applies if N and C are large.

This criterion applies if N or C is not particularly large.