Using R for estimating longitudinal student achievement models. Lockwood, J. R., Doran, H., & McCaffrey, D. F. R News, 3(3):17–23, 2003.
bibtex   
@article{lockwood_using_2003,
	title = {Using {R} for estimating longitudinal student achievement models},
	volume = {3},
	number = {3},
	journal = {R News},
	author = {Lockwood, J. R. and Doran, H. and McCaffrey, D. F.},
	year = {2003},
	pages = {17--23}
}

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