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6. Process or Product Monitoring and Control
6.5. Tutorials
6.5.4. Elements of Multivariate Analysis Hotelling's T squared

Chart for Individual Observations -- Phase II

Control limits In Phase II, each value of \(Q_j\) would be plotted against the UCL of $$ \frac{p(m+1)(m-1)}{m^2 - mp} F_{\alpha,\, (p, \, m-p)} \, , $$ with, as before, \(p\) denoting the number of characteristics.
Further Information The control limit expressions given in this section and the immediately preceding sections are given in Ryan (2000, Chapter 9).
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