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    Degrees of Freedom for linear combination of VarianceComponents

    I was trying to figure out satterthwaite's degrees of freedom for the combination of variance component to calculate confidence interval. I can get the confidence interval for individual variances using lme4 package in R. I am interested in calculating confidence interval for combination of...
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    simultaneous confidence interval for difference between slopes in ANCOVA

    I am new to the forum and R. I am using R version 3.2.0 on Windows7. I am trying to find the simultaneous confidence interval of pairwise difference between slopes. In my data, there are three variables - Y, X and group. I am trying to find CI of difference between slopes for all the...