The difference is comparing the city against the region. There are limitations in directly comparing these methods as they measure different ketone bodies. Science is the process of gathering, comparing, and evaluating proposed models against observables. This is useful for comparing engines of different displacements. More important estimates focus on comparing texts within languages. Studies comparing yields have had mixed results. Marx explains a flaw with this approach comparing two examples. It was negatively reviewed by critics with many comparing it unfavorably to the original. This can be predicted by comparing the polarity. It also represents a basis for comparing businesses. There are limits to the levelized cost of electricity metric for comparing energy generating sources. This can be either motivational or discouraging to the person comparing themself. They are comparing themselves to each other, not themselves. Just as likely, the scientific community may not be comparing the right groups of people. This becomes an issue when comparing or formatting numbers.