Find Non-Missing Subsamples
find_nonmissing_subsample(X)A (\(T\)x\(N\))-matrix of \(N\) time series with \(T\) observations. Data may also be in a time series format (e.g. ts, zoo or xts). Assumes a prior check on missing vaues in-sample has been done.
A list with the following components
range(2x\(N\))-dimensional matrix containing the first and last non-missing observation in each column of X.
all_equalLogical value indicating whether all series have the same non-missing indices.