Matches in Harvard for { ?s ?p The data were collected from among four groups of approximately 600 persons each, originally selected by a random stratified sample of Erie County, Ohio. Of the four groups, three were reinterviewed only once. Thefourth group of 600 respondents formed the core of the panel sample and were interviewed monthly from May to November 1940.. }
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- catalog description "The data were collected from among four groups of approximately 600 persons each, originally selected by a random stratified sample of Erie County, Ohio. Of the four groups, three were reinterviewed only once. Thefourth group of 600 respondents formed the core of the panel sample and were interviewed monthly from May to November 1940.".