a vector of means (e.g., coefficient estimates) for the normal random variables. A user can assign a name to each mean value, e.g., mu=c(b1=.1,b2=3); otherwise, the coefficient names are assigned automatically as follows: b1,b2,....
Sigma
either a covariance matrix or a vector that stacks all the columns of the lower triangle variance--covariance matrix one underneath the other.
quant
quantity of interest, which is a nonlinear/linear function of the model parameters. Argument quant is a formula that must start with the symbol "tilde" (~): e.g., ~b1*b2*b3*b4. The names of coefficients must conform to the names provided in the argument mu or to the default names, i.e., b1,b2,....
lower.tail
logical; if TRUE (default), the probability is \(P[quant < q]\); otherwise, \(P[quant > q]\)
n.mc
Monte Carlo sample size. The default sample size is 1e+6.
Tofighi, D. and MacKinnon, D. P. (2011). RMediation: An R package for mediation analysis confidence intervals. Behavior Research Methods, 43, 692--700. doi:10.3758/s13428-011-0076-x