TABLE 1. Selected Means from Sample Attrition.

	Sample 1*	Sample 2†	Sample 3‡	Analytic Sample§
Female	.53	.55	.55	.55
Non-Latino white	.54	.59	.59	.58
Living with both biological  parents	.57	.58	.59	.58
Parents’ level of education	6.12	6.21	6.23	6.16
Middle school GPA	2.83	2.95	2.95	2.94
N	12,167	3,147	3,044	2,679

^*Full wave 3 education component with valid transcript sample.

^†Included filter to sample 1 for only wave 1 middle school students.

^‡Included filter to sample 2 for having a valid sample weight.

^§Included filter to sample 3 for having data on the dependent variable (first-year GPA) and from a school with friendship data.