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. Author manuscript; available in PMC: 2009 Mar 30.
Published in final edited form as: J Educ Psychol. 2008 Nov 1;100(4):727–740. doi: 10.1037/a0013098

Figure 1.

Figure 1

Estimated two-piece linear growth curves of the four WJ scores. s1P and s2P represent the slopes in the short and longer terms for promoted children, and s1R and s2R represent the slopes in the short and longer terms for retained children. WJ = Woodcock-Johnson III. * p < .05.