Robust Hotelling 𝑇² Control Chart with Consistent Minimum Vector Variance

Table 5

Estimates of location vector, covariance matrix, and UCL.

Types of control chart	Location Vector (𝑋)	Scatter Matrix (𝑆)	Upper Control Limit (UCL)
𝑇^2	0.005040.002840.01579	0.000040.000020.000030.000020.000090.000010.000030.000010.00011	11.035
𝑇^2MCD	0.004140.002070.01096	0.000020.000000.000000.000020.00009−0.000020.00000−0.000020.00003	21.946
𝑇^2MVV(𝑜)	[0.003360.003540.00913]	0.000010.000010.000000.000010.000030.000000.000000.000000.00001	41.298
𝑇^2MVV(𝐼)	[0.003360.003540.00913]	0.000030.00002−0.000010.000020.00007−0.00001−0.00001−0.000010.00002	11.5513