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Mr Heckman confronted the sample-selection problem: in terms of the examples just given, for instance, the effect on the results if the workers who answered the questionnaire differed in important ways from those who did not.
ECONOMIST: Economics focus
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Most stalls tend to specialise in one particular dish, but between them they offer an opportunity to sample a good selection of Morocco's traditional food.
BBC: Djemaa el Fna, the beating heart of Marrakesh
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The mobile music service provides a rich music experience for everyone whether users are an avid collectors wanting easy access to their own music collection, someone with ever-changing music tastes, who likes to sample a broad selection of music and genres or individuals who prefer radio.
ENGADGET: Samsung Music Hub launches on Galaxy S III stateside with free trial in tow