@article{Ferris:284548,
      recid = {284548},
      author = {Ferris, John N.},
      title = {USE OF RATIOS AND GROSS MARGINS IN TIME SERIES SUPPLY  ANALYSIS},
      address = {1974-08},
      number = {2180-2019-1086},
      pages = {12},
      year = {1974},
      abstract = {Gross margins provide a means to (1) incorporate more a  priority information into time series supply analysis and  (2) consolidate two or more variables into one. Implicit in  applying ratios are certain restrictive assumptions. The  statistical fit of "gross margin" equations on five  commodities compared favorably wi.th "ratio" and "separate  variable" formulations.},
      url = {http://ageconsearch.umn.edu/record/284548},
      doi = {https://doi.org/10.22004/ag.econ.284548},
}