Corrected Item-Total Correlation，首字母即CITC。 它就是题项与提总相关系数，指的是单个题项与其他题项的相关性，如果citc偏低，比如citc低于0.4，那说明该题项与其他题项相关性较弱，同质性较差。

The item–total correlation is the correlation between a scored item and the total test score. It is an item statistic used in psychometric analysis to diagnose assessment items that fail to indicate the underlying psychological trait so that they can be removed or revised.

2009年3月26日 · What is the item total correlation, and what does it mean? The item total correlation is a correlation between the question score (e.g., 0 or 1 for multiple choice) and the overall assessment score (e.g., 67%).

1.校正项总计相关性：校正项总计相关性（Corrected Item-Total Correlation）是指计算每个题目（或变量）与该测量工具的总分之间的相关性。 它衡量了每个题目与整体测量的内在一致性。

Well-known item-quality indices used in test construction are (a) the item-rest correlation, also known as the corrected item-total correlation (Lord & Novick, 1968, p. 330); (b) the loading of an item on the factor which it co-defines (Harman, 1976, p. 15), in this study called the item-factor loading; (c) the item scalability (Mokken, 1971 ...

2017年9月27日 · This article is organized as follows: First, we discuss item-score reliability methods MS, λ 6, and CA, and the item-rest correlation, the item-factor loading, the item scalability, and the item discrimination. Second, the different sets of empirical data for which the seven item indices were estimated are discussed.

The results showed that the benchmark corrected item-total correlation was the best item-assessment method in both the bottom-up and top-down item selection procedure. This means that the frequently employed and simpler corrected item-total correlation is, next to method CA, one of the best item-assessment methods when constructing tests.

2021年5月14日 · Item-Total Correlation Coefficients. Another approach to examining item discrimination is to correlate performance on the items (scored as either 0 or 1) with the total test score. This is referred to as an item-total correlation. The total test score is usually the total number of items answered correctly (unadjusted) or the total number of ...

3 天之前 · The reliability analysis of the 24-item RRI-C full scale revealed good internal consistency: Cronbach’s alpha = 0.97, McDonald’s omega total = 0.97, and average item correlations = 0.55. Additionally, the total scale demonstrated IRT marginal reliability greater than.80 within the range of theta values between -3.7 and + 2.

2025年2月24日 · The 1PL, or Rasch, model has the advantage that the total score (sum of the item responses) serves as a sufficient statistic for the person’s ability. ... The second application example examines the precision of the estimated correlation between a latent personality trait and a metric criterion in a forced-choice personality test. In addition ...