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. Author manuscript; available in PMC: 2011 May 22.
Published in final edited form as: Sociol Educ. 2010;83(2):201–226. doi: 10.1177/0038040710375686

Table 3.

Estimated Coefficients for Quadratic Growth Model of Math and Reading Achievement Scores

Fixed Effects Math Reading
Coef. Std. error t ratio p Coef. Std. error t ratio p
 Intercept, πoij 5.99 0.21 27.90 <0.001 7.49 0.31 24.14 <0.001
 Age, π1ij 23.55 0.22 107.22 <0.001 29.96 0.31 96.59 <0.001
 Age2, π2ij −1.16 0.03 −38.76 <0.001 −1.55 0.04 −37.43 <0.001
Random Effects Variance Comp. df χ2 p Variance Comp. df χ2 p
Level 1
 eti 38.21 69.39
Level 2
 Intercept, πoij 34.68 2,524 3,773.39 <0.001 75.10 2,463 3,875.85 <0.001
 Age, π1ij 53.25 2,524 4,601.01 <0.001 111.68 2,463 4,764.18 <0.001
 Age2, π2ij 0.65 2,524 3,714.85 <0.001 1.37 2,463 3,863.45 <0.001