In lieu of an abstract, here is a brief excerpt:Based on his grammaticality judgment test, Harada (1971) claimed that there is an ongoing change, whereby the speakers of Tokyo Japanese increasingly prefer ga to no in relevant environments. In this paper, I present a quantitative analysis using the Corpus of Spontaneous Japanese. The goal of this study is not only to validate the findings in Nambu (2007) and Nambu and Matsuda (2007), but also to give another perspective on the variation.