In this form, the dots or pins represent numerical values and effectively show geographic location. The placing of the dots is an important item. If the exact geographic distribution of the data is known, the placing of the dots is no problem. However, when the data is in the form of general geographic distribution, such as data for an entire state, the dots are distributed throughout the whole state although one section may have contributed the total amount.
Each dot
represents
one plantation
WPA, Diviaion of Social Rrscarch, "Landlord and Tenant on the Cotton Plantation," 1936.
Distribution of the Plantations Which Were Enumerated in the Study of the Cotton Plantation Made by the Works Progress Administration.
When the number of samples is small, the location of each may be shown on a map as was done here. Compare with 178.
GRAPHIC PRESENTATION
WPA. National Rrtearch Project, "ChanRcs in Technology and Lalx)r Requirements in Crop Production -- Potatoes," 1938. SCALE .8
A. Potatoes Produced for Sale in the United States in 1929.
1. In a dot map it is important to know whether the dot has been placed in its exact
geographical position or whether the dots are distributed within a county or state irrespective of the exact location.
2. In this case, there is little doubt but that the dots were placed where the potatoes were
produced.
WPA. Division of Social Research. 'Rural Youth on Relief." 1037.
SCALE 8
B. Rural Rehabilitation Cases Receiving Advances of Capital or Goods in the United States in 1935.