IPO model is Input->Process->Output

# Archives for March 2014

## Data Analysis

Doing statistical data analysis usually involves the following: Measuring of the central tendency. Measure of the variation. Evaluation of the shape of the data. A histogram is useful in evaluating the shape of the data. 4 Questions of Data Analysis (nice flow chart): http://www.spcpress.com/pdf/DJW204.pdf

## Central Tendency

Used in basic data analysis. A central tendency is rarely perfectly centered. Even if it was, it wouldn’t stay that way. As time goes on a standard deviation can drift over 1.5 sigma over time. If there was no 1.5 sigma drive a 6 Sigma process would only generate 2 defects per BILLION! As it […]