Multivariate modeling of age and retest in longitudinal studies of cognitive abilities
Multivariate modeling of age and retest in longitudinal studies of cognitive abilities
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DOI：
10.1037/0882-7974.20.3.412
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发表时间：
2005-09-01
影响因子：
3.7
通讯作者：
Schwartz, BS
中科院分区：
文献类型：
--
作者：
Ferrer, E;Salthouse, TA;Schwartz, BS
纵向多变量混合模型被用来研究记忆和加工速度之间的变化的相关性，以及年龄和重测对这种变化的贡献。将各种年龄和年龄混合模型拟合到成年个体的2个纵向数据集（N > 1，200）。对于这两个数据集，结果表明，记忆和加工速度的年龄斜率之间的相关性下降时，重测效应包括在模型中。如果数据中存在重测效应但未建模，则年龄斜率之间的相关性存在正偏倚。作者认为，尽管记忆和处理速度的变化可能与时间有关，但年龄本身并不能捕捉到这种协变。
Longitudinal multivariate mixed models were used to examine the correlates of change between memory and processing speed and the contribution of age and retest to such change correlates. Various age- and occasion-mixed models were fitted to 2 longitudinal data sets of adult individuals (N > 1,200). For both data sets, the results indicated that the correlation between the age slopes of memory and processing speed decreased when retest effects were included in the model. If retest effects existed in the data but were not modeled, the correlation between the age slopes was positively biased. The authors suggest that although the changes in memory and processing speed may be correlated over time, age alone does not capture such a covariation.