Many types of businesses use product samples to allow potential and prospective customers to experience their products in hopes of enticing them to buy. Restaurants, for example, might offer free ...

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This is a preview. Log in through your library . Abstract Purpose Measurement development in hard-to-reach populations can pose methodological challenges. Item response theory (IRT) is a useful ...

Survey researchers increasingly recognize that a single survey of the general public can rarely represent the views of small groups of Americans. Such surveys frequently have too few interviews with ...