Comparing t Test, rit Significance Test, and rit Criteria for Item Selection Method: A Simulation Study
DOI:
Abstract Views:
447 times
PDF - Full Text Downloads:
286 times
Abstract
Three criteria of items selection have been widely used despite of their limitations without any empirical evidence to support its practice. Current study examined the three criteria to determine which of the three criteria were the best among the others. Those criteria were the item total correlation, its significance by t-test and significance of rit. Simulations were conducted to demonstrate which of the three criteria provided the least errors in both excluding good items and including bad items in the scale. The author manipulate four conditions in conducting simulation study: (a) number of items in a scale; (b) value of rit in population; (c) sample sizes; and (d) criteria in including or excluding items in a scale. The results showed that criteria of rit > .30 provided the least errors of including bad items and excluding good items, particularly when n > 200. The two criteria based on significance test provided the largest errors therefore were not recommended in future practice.
Downloads
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Articles published in ANIMA are licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International license. You are free to copy, transform, or redistribute articles for any lawful, non-commercial purpose in any medium, provided you give appropriate credit to ANIMA and the original Author(s), link to the license, indicate if changes were made, and redistribute any derivative work under the same license.
Copyright on articles is retained by the respective Author(s), without restrictions. A non-exclusive license is granted to ANIMA to publish the article and identify itself as its original publisher, along with the commercial right to include the article in a hardcopy issue for sale to libraries and individuals.
By publishing in ANIMA, Author(s) grant any third party the right to use their article to the extent provided by the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International license.
