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Why are longitudinal studies used in realtion to language development and intelligence?

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A longitudinal study collects data from the same subjects over time.  If one is studying language development and intelligence, observation of the same subjects, usually very young children, affords a researcher a way of seeing how language develops and a way of gathering information about intelligence, which may or may not develop over time,  something we would all like very much to know.  If we...

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