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SCHOOLS SKILLS AND SYNAPSES James J. Heckman NBER Working Paper No. 14064 June 2008 JEL No. A12 Elena Broccini.
IRT Fixed Parameter Calibration and Other Approaches to Maintaining Item Parameters on a Common Ability Scale Seonghoon Kim, PhD Keimyung University Email:
Graduate returns, HE expansion and ability composition
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The choice between fixed and random effects models: some considerations for educational research
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