Linear extrapolation step of SIMEX algorithm.
linearextrapolation(A1, A2, A3, lambda)estimates obtained from each level of labmda.
variances estimates obtained from each level of lambda.
scale estimates obtained from each level of lambda.
vector of lambdas, the grids for the extrapolation step.
extrapolation back to lambda=-1 yield the SIMEX estimates
extrapolation back to lambda=-1 yield the SIMEX estimates of variances
extrapolation back to lambda=-1 yield the SIMEX estimates of scale
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Therneau, T. and Lumley, T. (2011). survival: Survival Analysis, Including Penalised Likelihood. R package version 2.36-10, URL http://CRAN.R-project.org/package=survival.