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S- Sampling is a method to smartly replicate an index.

Enhanced indexing is an active form of indexing wherein an investor slightly tilts the various parameters of the portfolio w-r-t the benchmark. However, it is ensured that the duration of the portfolio remain equated with the duration of the benchmark index.


so S sampling is just a way to effeciently replicate a benchmark index.

whereas

E indexing is a strategy of exploiting miniature ineffeciency together with matching the durations of portfolio and benchmark index.