Squared Extrapolation Methods for Accelerating EM-Like Monotone
Algorithms
Algorithms for accelerating the convergence of slow, monotone 
    sequences from smooth, contraction mappings such as the EM algorithm. 
    It can be used to accelerate any smooth, linearly convergent scheme. 
    A tutorial-style introduction is available in vignette("SQUAREM"). 
    See also: Varadhan & Roland (2008) <doi:10.18637/jss.v092.i07>.
person(given = "Ravi",
                  family = "Varadhan",
                  role = c("aut", "cre"),
                  email = "ravi.varadhan@jhu.edu")