Exam 22: Structural Equation Modeling and Path Analysis

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Which of the following is true about the relationship of SEM to multiple regression techniques?

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SEM models are estimated so as to minimize the difference between the observed and estimated covariance matrices.

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Describe the assessment of discriminant validity in a measurement model.

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In order to establish discriminant validity,we must show that the construct is distinct from other constructs and thus makes a unique contribution.First,individual observed variables should load on only one latent construct.Cross-loadings indicate lack of distinctiveness and present potential problems in establishing discriminant validity.
One formal way to show distinctiveness is to set the correlation between any two constructs as equal to one,i.e. ,we are specifying that observed variables measuring the two constructs might as well be represented by only one construct.Evidence of discriminant validity is obtained if the fit of the two-construct model is significantly better than the fit of the one-construct model.However,this actually turns out to be a weak test as significant fit differences may be obtained even when the correlations between the two constructs are very high.
An alternative test of discriminant validity is based on the logic that a construct should explain its observed variables better than it explains any other construct.This test is conducted by showing that the average variance extracted is greater than the square of the correlations.Equivalently,discriminant validity is achieved if the square root of the average variance extracted is larger than correlation coefficients.

SEM models are estimated so as to maximize the likelihood function.

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SEM is distinguished by the explaining of the covariance among the measured items or observed variables.

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Dependence relationships are represented with one-headed straight arrows in a path model.

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Which of the following is not a fit measure?

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Dependence relationships are represented with two-headed curved arrows in a path model.

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PNFI statistic is most useful for comparing nested models.

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The impact of the average error variance of indicators can be understood in terms of communality.

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Describe path analysis and its relationship to SEM.

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Once the validity of the measurement model has been established,you can proceed with the specification of structural model.

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Convergent validity is established when the measured items are conceptually consistent with a construct definition.

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CFI is an incremental fit index.

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When two constructs are theoretically unrelated to each other,the path between those two constructs should be ________.

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In moving from the measurement model to the structural model the error terms are correlated with each other.

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SEM can be thought of as a combination of Factor analysis and multiple regression analysis.

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In moving from the measurement model to the structural model ________.

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The baseline model that is commonly used is the null model that is based on the assumption that the observed variables are uncorrelated.

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The size of the loading estimates considered significant is a difference contrasting EFA with CFA.

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