. Author manuscript; available in PMC: 2011 Dec 1.

Published in final edited form as: J Sch Psychol. 2010 Dec 1;48(6):555–583. doi: 10.1016/j.jsp.2010.08.003

Table 4.

Parameter Estimates for the 3-Class Unconditional Model

	Estimate	SE	Estimate/SE
Class 1 (Low)
Intercept mean	.12	.01	11.37^*
Slope mean	−.01	.00	−2.96^*
Class 2 (Chronic High)
Intercept mean	.91	.12	7.66^*
Slope mean	−.09	.03	−3.57^*
Class 3 (Low increasing)
Intercept mean	.267	.09	3.07^*
Slope mean	.08	.03	2.81^*
Common Parameters^a
Intercept variance	0.0	0.0	0.0
Slope variance	0.0	0.0	0.0
Covariance (intercept and slope)	0.0	0.0	0.0
Residual variance, kindergarten	.03	.01	4.45^*
Residual variance, 1^st grade	.03	.01	4.76^*
Residual variance, 3^rd grade	.04	.01	6.08^*
Residual variance, 5^th grade	.02	.00	5.35^*

Parameters were the same across groups because they were constrained to be equal.

p < .05