com.ci: Calculates a confidence inteval for a common slope (called by...
In smatr: (Standardised) Major Axis Estimation and Testing Routines

Calculates a confidence inteval for a common slope (called by slope.com)

1	com.ci(b, varb, crit, z, n, l1, l2, method, lambda, res.df, r.factor)

`b`	Common slope estimate.
`varb`	Estimated variance of the common slope.
`crit`	Critical value to be used in confidence interval calculation.
`z`	Variances and covariances of each group.
`n`	Sample sizes of each group.
`l1`	Variance of fitted axis scores, for each group.
`l2`	Variance of fitted residuals, for each group.
`method`	See slope.com for details.
`lambda`	Error variance ration (implied by choice of method.
`res.df`	Residual degrees of freedom, for each group.
`r.factor`	A vector of "robust factors" for each group, default value 1. Variance estimates are rescaled by this factor when using robust inference.