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Two stage least squares estimation cannot be applied to a panel data set.
Reliability
The degree to which an assessment tool produces stable and consistent results over multiple administrations or applications under the same conditions.
Validity
The extent to which a concept, conclusion, or measurement is well-founded and likely corresponds accurately to the real world.
100% Reliable
An absolute level of dependability and consistency in performance or outcome that is often considered unachievable in practice.
Construct Validity
Construct validity is demonstrated when the measures of one concept or construct agree with the measures of other related concepts.
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