Although his fellowship was extended to travel to Italy and France, the next year Frisch had to return to Norway because of his father's death. He spent one year to modernize and recapitalize his family's workshop by selling family assets and to find a jeweller to manage the business for him. Then he resumed academic work, in 1928 being appointed Associate Professor of statistics and economics at the Oslo University. During 1927 and 1928 Frisch published a series of articles on the statistics of time series. In 1929 he published his first important essay on econometric methodology, "Correlation and scatter in statistical variables", followed in the same year by "Statics and dynamics in economic theory", which introduced dynamics in economic analysis.