Arnold Zellner and Hang Ryu, "Alternative Functional Forms for Production,
Cost, and Returns to Scale Functions", Journal of Applied Econometrics,
Vol. 13, No. 2, 1998, pp. 101-127.

The source of data is "Zellner, A. and N. Revankar (1969), Generalized
Production Functions," The Review of Economic Studies, 36, 241-250. 

Data description : 1957 U.S. Annual Survey of Manufactures Data for the
Transportation Equipment Industry. 

Data are in the file data.zr, which is in plain ASCII format. The data are
ordered variable by variable in the same sequence as listed below.

variable

1. State
2. Aggregate value added  (unit : millions of dollars)
3. Aggregate capital service flow (unit : millions of dollars)
4. Aggregate man-hours worked (unit : millions of man-hours)
5. No. of establishments