Thursday, April 23, 2009

Dominance approach vs. ideal-point approach in item selection

Dominance approach (Coombs, 1964; Likert, 1932)
  • It is about measuring people's ability
  • It uses items of high internal consistency.
  • Therefore, if a person scores low on one item, he/she should be score low on the total scores as well. Likewise, if I score higher on the item than you do, my ability would be dominant over your ability.
  • In IRT terminology, DIF (Differential Item Functioning) refers to "a difference in the probability of endorsing an item for members of a reference group (e.g., US workers) and a focal group (e.g., Chinese workers) having the same standing on the latent attribute measured by a test." It is related to dominance approach.
Ideal-point approach (Thurstone, 1928)
  • It is about measuring people's attitude
  • Individuals will endorse an item to the degree that it reflects
  • More neutral items should be included

41 comments:

  1. 要保持更新呦,加油!!!期待你的新文章!!! ........................................

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  10. 感謝您願意分享您的生活經驗~~支持您的更新哦!............................................................

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  12. 聰明人之所以不會成功,是因為他們缺乏了堅忍的毅力。..................................................

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  14. 培養健全孩子最好的方法是父母先成為健全的人。......................................................................

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  16. 人不能像動物一樣活著,而應該追求知識和美德............................................................

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  17. 一個人的價值,應該看他貢獻了什麼,而不是他取得了什麼......................................... ........................

    ReplyDelete