For W to Be an Effective Control Variable in IV

question 28

Multiple Choice

For W to be an effective control variable in IV estimation, the following condition must hold

• A)E(u_i)= 0
• B)E(u_i|Z_i,W_i)= E(u_i|W_i)
• C)E(u_iu_j)≠ 0
• D)there must be an intercept in the regression

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Definitions:

Digestive Process

The complex series of physical and chemical changes that food undergoes from ingestion to absorption into the bloodstream.

Inflammation

A biological response to injury or infection, characterized by swelling, redness, pain, and sometimes loss of function.

Liver

A vital organ in the human body involved in numerous metabolic processes, including detoxification, protein synthesis, and the production of biochemicals necessary for digestion.

Upper GI Series

A series of X-rays taken of the upper digestive system, including the esophagus, stomach, and first part of the small intestine, often using a contrast medium to enhance visibility.