An asymptotically optimal selection of regression variables is proposed. The key assumption is that the number of control variables is infinite or increases with the sample size. It is also shown that ...

Business forecasting is essential for the survival for companies of all sizes. The building block used by forecasters is historical data or the past performance of the business to predict future ...

Although quality is often measured by the joint level of several correlated random variables, it is common to find in practice, control decisions based on individual Shewhart charts. Hotelling (1947) ...