Class size and teacher effects on non-cognitive outcomes in grades K-3: a fixed effects analysis of ECLS-K:2011 data

Large-scale Assessments in Education

An IERI – International Educational Research Institute Journal

Table 1 Weighted descriptive statistics of variables included in analyses

	Self-control		Interpersonal skills		Approaches to learning		Externalizing behaviors		Internalizing behaviors
	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD
Dependent variables
Self-control	3.219	0.622
Interpersonal skills			3.151	0.651
Approaches to learning					3.093	0.694
Externalizing problem behaviors							1.694	0.616
Internalizing problem behaviors									1.558	0.513
Independent variables
Class size	20.878	4.056	20.852	4.021	20.886	4.043	20.882	4.050	20.863	4.040
Class size (≤ 20 students)	0.468	0.499	0.471	0.499	0.466	0.499	0.467	0.499	0.468	0.499
Class size (≤ 17 students)	0.170	0.376	0.171	0.376	0.169	0.375	0.170	0.376	0.171	0.376
Class size (≤ 15 students)	0.076	0.264	0.075	0.263	0.075	0.263	0.075	0.264	0.076	0.265
Teacher education	0.485	0.500	0.485	0.500	0.483	0.500	0.484	0.500	0.482	0.500
Teacher certification	0.916	0.277	0.917	0.277	0.916	0.277	0.916	0.277	0.916	0.277
Teacher experience	14.643	9.683	14.634	9.706	14.659	9.685	14.638	9.677	14.654	9.693
Student changed school	0.041	0.198	0.042	0.201	0.042	0.200	0.042	0.201	0.042	0.200
Number of students	6004		6052		6289		6232		6149
Number of total observations	24,016		24,208		25,156		24,928		24,596