学会発表（国際）
Inverse probability widthed estimators in the stratified nested case-control sampling method.
Tanaka S, Tanaka S, Matsuyama Y, and Yamamoto S. Inverse probability widthed estimators in the stratified nested case-control sampling method. 2007 Joint Statistical Meetings, Salt Lake City, Utha, July 29 - August 2, 2007. Abstract 220.