Shewhart-Type Charts for Masked Data: A Strategy for Handling the Privacy Issue

Table 1

LCL and UCL for different values of by fixing .

	0.0	0.1	0.2	0.3	0.4	0.5	0.6	0.7	0.8	0.9	1.0
LCL1	—	−17.00	−6.856	−3.198	−1.5	−0.5162	0.1919	0.69299	1.0836	1.3954	1.6590
UCL1	—	28.065	15.000	10.882	8.6196	7.3378	6.4195	5.76387	5.2460	4.7978	4.3425
LCL2	0.8039	0.7592	0.7472	0.7552	0.7868	0.83772	0.91255	1.01712	1.15842	1.36104	1.6595
UCL2	6.4131	6.6762	6.9520	7.2483	7.5714	7.90128	8.2553	8.60071	8.84422	8.81542	4.3425
LCL3	0.5211	0.3632	0.3421	0.3840	0.4727	0.6145	0.7894	0.9895	1.1984	1.4256	1.6586
UCL3	5.8764	6.0129	6.1411	6.2221	6.2732	6.30638	6.2715	6.17769	5.96799	5.59876	4.3353