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Perturbation
Database: d = d1,…,dn
Query: q [n]
Exact answer: aq = iqdi
Perturbed answer: âq
Perturbation E:
For all q: | âq – aq| ≤ E
General Perturbation:
Prq [|âq – aq| ≤ E] = 1-neg(n)
= 99%, 51%
Notes:
This model extends the previously studied models.
Random does not mean uniformly at random, can be a contrived distribution.