Glossary “G” Definition of Terms in DataMyte

Goodness-of-Fit

Any measure of how well a set of data matches a proposed distribution. Chi-square is the most common measure for frequency distributions. Simple visual inspection of a histogram is a less quantitative, but equally valid, way to determine goodness-of-fit. 

Grand Average

Overall average of data represented on an x chart at the time the control limits were calculated. See also Centerline.