表述效应对平衡量表内部一致性信度的影响

The Influence of the Method Effect Associated with Item Wording on the Internal Consistency Reliability of Balanced Scale

通过蒙特卡洛模拟研究考察平衡量表中源自条目不同计分方向的表述效应及量表内因素对测量结果内部一致性信度系数α系数和组合信度(CR)系数的影响.方差分析结果验证了研究假设:表述效应使平衡量表的α系数与CR系数被高估,高估程度随方法因子负荷升高(F(2,392)=345.10,344.87,p<0.001),不同计分条目比例失衡(F(2,392)=8.03,8.32,p<0.001),方法因子间相关(F(4,392)=7.14,7.02,p<0.001)和特质因子负荷的降低(F(2,392)=411.96,410.49,p<0.001)而加剧.表明编制量表时,须提升条目质量并尽量使不同计分条目数相等.

Monte Carlo simulation was made to investigate the laws and characteristics of how wording effect（or the Method Effect Associated with Item Wording）and its relevant endogenous factors affected the internal consistency reliability coefficient,Cronbach＇sαand composite reliability coefficient of the outcomes of measurement.Then multifactor variance analysis was made,in which five independent variables were manipulated：method factor loading of item,trait factor loading of item,ratio of different scoring items,correlation between different method factors and sample size.The results showed that both Cronbach＇sαand composite reliability coefficient in the balance scale would be overestimated due to the item wording effect and that the extent of overestimation increased with the increase in the item＇s method factor loading（F（2,392）=345.10 and 344.87,p〈0.001）and the decrease in imbalance of different scoring items（F（2,392）=8.03 and 8.32,p〈0.001）,correlation between different method factors（F（4,392）=7.14 and 7.02,p〈0.001）,or item＇s trait factor loading（F（2,392）=411.96 and 410.49,p〈0.001）.The results suggested that the completely balanced scale was better under the condition of improving the psychometric properties of items.