Negative variance components and intercept-slope correlations greater than one in magnitude: how do such ``non-regular'' random intercept and slope models arise, and what should be done when they do? (Q6615928)
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scientific article; zbMATH DE number 7923602
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | Negative variance components and intercept-slope correlations greater than one in magnitude: how do such ``non-regular'' random intercept and slope models arise, and what should be done when they do? |
scientific article; zbMATH DE number 7923602 |
Statements
Negative variance components and intercept-slope correlations greater than one in magnitude: how do such ``non-regular'' random intercept and slope models arise, and what should be done when they do? (English)
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8 October 2024
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boundary problems
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improper solutions
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mixed models
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non-positive semidefinite covariance matrices
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random slopes
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singular fit
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