After studying in Germany, he took his doctorate on "Tokei Riyo ni okeru Kihon Mondai" (Basic Problems in Using Statistics), but he was promoted to full professor much later in 1942.
ドイツに留学後、『統計利用に於ける基本問題』で経済学博士号を取得するも教授に昇格するのはずっと遅く1942年だった。