Which of the Following Are Probably Valid Criticisms of the Dickey

question 12

Multiple Choice

Which of the following are probably valid criticisms of the Dickey Fuller methodology?
(I) The tests have a unit root under the null hypothesis and this may not be rejected due to insufficient information in the sample
(ii) the tests are poor at detecting a stationary process with a unit root close to the non-stationary boundary
(iii) the tests are highly complex to calculate in practice
(iv) the tests have low power in small samples

• A) (i), (ii), (iii) and (iv)
• B) (i), (ii), and (iv) only
• C) (i) and (iii) only
• D) (ii) only

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Definitions:

Cycle Inventory

The portion of inventory that companies hold to facilitate smooth production and sales operations, fluctuating based on production cycle needs.

Low-Value Product

Products that have a low price point or perceived economic value to the consumer, often resulting in slim profit margins.

High Demand

A situation where the desire and need for a product or service greatly exceeds the available supply within a market.

Transportation

The movement of goods and people from one location to another using various modes such as road, rail, air, and sea.