Samenvatting
There are two types of sample surveys, descriptive and analytic. These are described. An example of a safety measures program with three variables interacting in time and effect is given.
There are two types of sample surveys, descriptive and analytic. These are described. An example of a safety measures program with three variables interacting in time and effect is given.
In: Research project design and program development, Highway Research Record HRR No. 338, 1970, p. 19-21
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