A design is called feasible if all the ANOVA parameters in it are estimable. This paper provides a simple method to judge the feasibility of a design using matrix image. Furthermore, a broad family of feasible designs is obtained.

In this empirical study, we test the relationship of Chinese urban productivity and city size. Using over 119 790 firm-level production data cross 28 industries from the Third National Industrial Survey, along with the urban population data of 224 cities, we find strong and prevailing...