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A sample in which observations on the dependent variable are missing or reported as a single value for a known set of values of independent variables. For example, if the demand for concert tickets in a certain concert hall is measured by the number of tickets sold, the true demand is not observed whenever some concert is sold out: in all such cases the same total number of tickets sold is reported. See also Tobit model.
Reference: Oxford Press Dictonary of Economics, 5th edt.
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