ABSTRACT
As much as we’d like to begin building properly designed experiments geared for RSM, it is necessary to first dispel the notion that you can save time and money by simply gathering data from historical records. To some extent, this chapter serves a similar purpose to the lectures given to teens on the dangers of drugs, tobacco, sex, etc. Regression of happenstance data may be every bit as addicting as these substances and activities. However, we’re all adults now, so a better reason for discussing happenstance regression may be to slip in some new statistics that can be extremely helpful for diagnosing lousy layouts of input factors.
