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篇名 |
影響積差相關係數與α信度係數之因素
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並列篇名 | Factors Affect Pearson Correlation and Coefficient Alpha |
作者 | 傅粹馨 |
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 researchand Cronbach's coefficient alpha( α ) plays animportant role in testconstruction. Two topics were investigated in the article: factors affectPearson r and coefficient alpha. Four issues were included in the part offactors affect r: first, the assumptions under r: linear relationship betweenvariables, similar distribution, and homoscadasticity; second, spuriouscorrelation; 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: phicorrelation, point-biserial correlation, biserial correlation, and Spearman rankcorrelation. Five issues were discussed in the part of factors affect alpha:first, the definition of reliability; second, the meaning and characteristics ofreliability; third, internal consistency and dimensionality; fourth, thecalculation of coefficient alpha; and fifth, factors affect coefficient alphaincluding: homogeneity or heterogeneity of subjects, the length of a test,interitem correlation, and homegeneity of item difficulty. |
起訖頁 | 193-206 |
刊名 | 教育學刊 |
期數 | 199806 (14期) |
出版單位 | 國立高雄師範大學教育學系 |
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