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Does every level of f1 occur in conjunction with exactly one level of f2? The function is based on converting a triplet sparse matrix to a compressed column-oriented form in which the nesting can be quickly evaluated.

isNested(f1, f2)

TRUE if factor 1 is nested within factor 2

factor 1

factor 2

with(Pastes, isNested(cask, batch)) ## => FALSE with(Pastes, isNested(sample, batch)) ## => TRUE

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