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September 2, 1939, Vol 113, No. 10 >
Other Articles | September 2, 1939

ORGANIZATION SECTION

JAMA. 1939;113(10):943-948. doi:10.1001/jama.1939.02800350053019.
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ECONOMICS OF THE PRACTICE OF RADIOLOGY  The Inter-Society Committee for Radiology, in an effort to obtain factual information concerning the practice of radiology, sent schedules to 1,434 members of the four radiologic societies, the American Roentgen Ray Society, the American Radium Society, the Radiological Society of North America and the American College of Radiology. A total of 876 completed schedules were returned by radiologists in every state in the United States. The following tabulation of the information furnished by these radiologists, who so generously took time to answer the fifty-one questions asked, makes available for the first time data concerning the economics of the practice of radiology.

REPRESENTATIVENESS  In any sample study it is a fundamental requisite that the sample be representative of the entire population from which the sample is taken; otherwise the tabulation of information will be biased. Too frequently fine statistical calculation must be used to test

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Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

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