In9 In1 In9 Hi1 His Hi1 Hi9 Hi1 Hi9 Hi1 Hi9

FIGURE 27.1. Heuristic representation of a multitrait by multisource model for the attention-deficit/hyperactivity disorder (ADHD)-inattention (IN), ADHD-hyperactivity/impulsivity (HI), and oppositional defiant disorder (ODD) symptom ratings (26 symptom ratings per source—nine ADHD-IN symptoms, nine ADHD-HI symptoms, and eight ODD symptoms).

FIGURE 27.1. Heuristic representation of a multitrait by multisource model for the attention-deficit/hyperactivity disorder (ADHD)-inattention (IN), ADHD-hyperactivity/impulsivity (HI), and oppositional defiant disorder (ODD) symptom ratings (26 symptom ratings per source—nine ADHD-IN symptoms, nine ADHD-HI symptoms, and eight ODD symptoms).

model. The inspection of the individual parameters provides information on the amount of trait (construct), source, and error variance in each manifest variable, the magnitude of the correlations among the specific pairs of latent traits, and the magnitude of the correlations among the specific pairs of latent sources. The findings at the individual parameter level are central to the evaluation of the construct validity of each measure (manifest variable). In fact, the findings at the parameter level can significantly qualify the positive findings from the matrix levels tests (Byrne, 1994, chap. 6). Because of this, it is important to understand the meaning of trait, source, and error effects in the manifest variables.

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