Missing data

Appendix Table C1

	1998	2010
Variable	Percent missing	Percent missing
Race/ethnicity
White	0.2	0.5
Black	0.2	0.5
Hispanic	0.2	0.5
Hispanic English language learner (ELL)	6.6	11.8
Hispanic English speaker	6.6	11.8
Asian	0.2	0.5
Others	0.2	0.5
Socioeconomic status	5.9	11.9
Family composition: Not living with two parents	15.5	26.3
Mother’s education	7.5	42.8
Pre-K care, center-based	16.8	17.4
“Literacy/reading activities” index	15.6	26.4
“Other activities” index	15.6	26.5
Parents’ expectations for children’s educational attainment	16.1	26.5
Number of books	16.3	26.7
Outcomes
Reading	17.7	13.8
Math	13.0	14.2
Self-control (by teachers)	13.8	25.4
Approaches to learning (by teachers)	10.4	18.7
Self-control (by parents)	15.8	27.3
Approaches to learning (by parents)	15.8	27.3

Note: For detailed information about the construction of these variables, see Appendix Table A1.

Source: EPI analysis of ECLS-K, kindergarten classes of 1998–1999 and 2010–2011 (National Center for Education Statistics)

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