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題 名 | 影響積差相關係數與α信度係數之因素=Factors Affect Pearson Correlation and Coefficient Alpha |
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作 者 | 傅粹馨; | 書刊名 | 教育學刊 |
卷 期 | 14 1998.06[民87.06] |
頁 次 | 頁193-206 |
分類號 | 520.31 |
關鍵詞 | 積差相關係數; α信度係數; |
語 文 | 中文(Chinese) |
中文摘要 | 在教育研究中,相關係數(r)之使用相當頻繁;而編製測驗過程中,α信度係數亦 扮演著重要的角色,故本文探討的二個主題包括; (一 ) 影響積差相關係數的因素;(二 ) 影響α信度係的因素。 影響積差相關係數之因素部分,內容包括五項:(一 )r 之基本假設 ;線性相關,分配相似性與等分散性;(二 ) 形成假性相關的原因; (三 ) 影響 r 之因素 有四:線性;二變項之分配情形;二變項分數之測量誤差與團體之變異量;(四 ) 不會影響 r 之因素:變數之線性轉換;(五 )r 之四個特例:φ相關;點二系列相關; 二系列相關和 斯皮爾曼等級相關。 影響α信度係數之因素部分,內容包括五項:(一 ) 信度之定義;(二 ) α係數的意義與特性; (三 ) 內部一致性單一向度與 (四 ) α係數之計算;(五 ) 影響 α係數之因素:受試之同質或異質;測驗之長度;題目間之相關;以及試題難度之同質性。 |
英文摘要 | Pearson correlation (r) is employed frequently in educational research and Cronbach's coefficient alpha( α ) plays animportant role in test construction. Two topics were investigated in the article: factors affect Pearson r and coefficient alpha. Four issues were included in the part of factors affect r: first, the assumptions under r: linear relationship between variables, similar distribution, and homoscadasticity; second, spurious correlation; third, factors affect r: linearity, distribution of variables, error of measurement, and restriction in range; fourth, factors do not affect r: linear transformation of variables; and fifth, special cases of r: phi correlation, point-biserial correlation, biserial correlation, and Spearman rank correlation. Five issues were discussed in the part of factors affect alpha: first, the definition of reliability; second, the meaning and characteristics of reliability; third, internal consistency and dimensionality; fourth, the calculation of coefficient alpha; and fifth, factors affect coefficient alpha including: homogeneity or heterogeneity of subjects, the length of a test, interitem correlation, and homegeneity of item difficulty. |
本系統中英文摘要資訊取自各篇刊載內容。