Significance Test for Random Effects
Calculates the p-value for the test of the slope variance and intercept-slope covariance using the likelihood ratio test method.
| 1 | 
| outp | is the lmer model object. | 
| p | is string of the variance component you want tested (place in double quotes). | 
| testcov | is FALSE by default for the variance component. If testcov = TRUE, the function retuns the test of the intercept-component covariance. | 
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