@article {2217, title = {How Big Is Big Enough? Sample Size Requirements for CAST Item Parameter Estimation}, journal = {Applied Measurement in Education}, volume = {19}, number = {3}, year = {2006}, pages = {241-255}, doi = {10.1207/s15324818ame1903_5}, url = {http://www.tandfonline.com/doi/abs/10.1207/s15324818ame1903_5}, author = {Chuah, Siang Chee and F Drasgow and Luecht, Richard} }