TYPE OF AGRICULTURE

    Frederic L. Pryor, 1985. The Invention of the Plow. Comparative 
    Studies in Society and History 27: 740-744.

    Frederic L. Pryor, 1984. The Transition to Agriculture: Some 
    Empirical Evidence. Ms.

    These data are reprinted with permission of the author and the publisher.
     (c) University of Cambridge Press.

      STDS54.DAT Variables 1123 - 1131
     <STDS54.DES>
     <STDS54.REL>

1123.  Major Agricultural Staple 

      2    . = Missing Data
     38    0 = Agriculture not practiced or confined to non-food crops
      1   10 = Buckwheat
     14   11 = Wheat
      4   12 = Barley
     15   13 = Millet
     30   14 = Sorghum
      9   15 = Maize
     10   16 = Dry Rice
      9   17 = Wet Rice
      1   18 = Rye
      1   19 = Teff

      9   21 = Yam
     10   22 = Taro or Okuma
      4   23 = White Potato
     16   24 = Cassava (Manioc)
      2   25 = Sweet Potato
     12   26 = Tubers in general

      4   31 = Bananas or Plantains
      2   32 = Breadfruit
      2   33 = Coconut
      1   34 = Ensete
          35 = Sago and other Palms
          36 = Pandanus

      1   40 = Industrial Crops, e.g., cotton

1124.  Agricultural Staple Data Quality: Inferences

     40    . = Missing Data
    137    0 = Good data
      9    1 = Inferential

1125.  Second Agricultural Staple

      2    . = Missing Data
     38    0 = Agriculture not practiced or confined to non-food crops
    117    1 = No secondary agricultural staple
          10 = Buckwheat
          11 = Wheat
      2   12 = Barley
      2   13 = Millet
      5   14 = Sorghum
      3   15 = Maize
      2   16 = Dry Rice
      3   17 = Wet Rice
          18 = Rye
          19 = Teff

          21 = Yam
      1   22 = Taro or Okuma
      1   23 = White Potato
      3   24 = Cassava (Manioc)
          25 = Sweet Potato
          26 = Tubers in general

      3   31 = Bananas or Plantains
          32 = Breadfruit
          33 = Coconut
          34 = Ensete
      3   35 = Sago and other Palms
      1   36 = Pandanus

          40 = Industrial Crops, e.g., cotton

1126.  Second Agricultural Staple Data Quality: Inferences

     40    . = Missing Data
    143    0 = Good data
      3    1 = Inferential

1127.  Crop Type Plow-Positive or -Negative

      2    . = Missing Data
     38    0 = Agriculture not practiced or confined to non-food crops
    112    1 = Plow-negative (Millet, Sorghum, Maize, Dry Rice, 
           *   Root/Tree Crops)
     34    2 = Plow-positive (Buckwheat, Wheat, Barley, Wet Rice, Rye, 
           *   Teff, Industrial Crops)

1128.  Cropping Index (Rough indicator of Fallowing) for Major Crops
       Percentage of total land used for major crops used in any given year
       (Tree crops are considered to have no fallow)

     24    . = Missing Data
     38    0 = Agriculture not practiced or confined to non-food crops
     22    1 = less than 10% of land used per year
     26    2 = 10% - 29% of land used per year
     15    3 = 30% - 49% of land used per year
     32    4 = 50% - 99% of land used per year
     29    5 = 100% or more of land used per year, 
               (over 100% due to double cropping)

1129.  Cropping Index Data Quality: Inferences

     62    . = Missing Data
     94    0 = Good data
     30    1 = Inferential

1130.  Population Density 

           . = Missing Data
     51    2 = less than 1 per square mile
     28    3 =   1 -   4.9 per square mile
     35    4 =   5 -  24.9 per square mile
     37    5 =  25 -  99.9 per square mile
     24    6 =  99 - 499.9 per square mile
     11    7 = 500 or more per square mile

1131.  Population Density Data Quality: Inferences

           . = Missing Data
    146    0 = Good data
     40    1 = Inferential

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