Nothing

```
#' Function to estimate coefficients at time t
#'
#' Part of the set of internal functions called within the \code{tvmcurve_3trt} function
#' to assist in the estimation of time varying mediation effect.
#'
#' @param j a number indicating time point of observation
#' @param T1 a vector indicating assignment to treatment 1
#' @param T2 a vector indicating assignment to treatment 2
#' @param x matrix of mediator values in wide format
#' @param y matrix of outcome outcomes in wide format
#'
#' @return \item{coeff.est}{estimated coefficients of the mediation model}
#' @return \item{nomissing.index}{index of complete cases}
#'
#'
coeff<-function(j, T1, T2, x, y)
{
X.new.j <- cbind(c(T1, rep(0, length(T1))), c(T2, rep(0, length(T2))),
c(rep(0, length(T1)), T1), c(rep(0, length(T2)), T2),
c(rep(0, length(T1)), as.numeric(x[j-1,])))
Y.new.j <- c(x[j,], y[j-1,])
X.new.j <- scale(X.new.j, center=TRUE, scale=FALSE)
Y.new.j <- scale(Y.new.j, center=TRUE, scale=FALSE)
nomissing.x <- complete.cases(X.new.j)
nomissing.y <- complete.cases(Y.new.j)
nomissing.index <- nomissing.x * nomissing.y
X.new.j <- X.new.j[which(nomissing.index==1),]
Y.new.j <- Y.new.j[which(nomissing.index==1)]
coeff.est <- solve(t(X.new.j)%*%(X.new.j))%*%t(X.new.j)%*%(Y.new.j)
list(coeff.est=coeff.est, nomissing.index=nomissing.index)
}
```

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