March 2009

Letters to the Editor

Letters to the Editor

Past Letters to the Editor:   February | January Debating biases I am a senior consultant with Honeywell and have over 20 years of experience in the areas of advanced process cont..

Past Letters to the Editor:   February | January Debating biases I am a senior consultant with Honeywell and have over 20 years of experience in the areas of advanced process control, inferential modeling and software programming. I am writing regarding Zak Friedman's "HPIn Control" column from the December 2008 issue (p. 130). Regarding the proposed bias update scheme, there are various methods of updating inferential models in use across the industry. These include the use of a bias attenuation factor, which works by multiplying the raw bias with a fraction between 0 and 1; the use of two-sided CUSUM SPC to detect mild to moderate shifts in the bias (this is tuna

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