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by jonathanwylie » Fri Mar 22, 2013 8:06 am
Hi,

Glad to elaborate! Let's take two categories of things: 1) cities 2) the locations of those cities. The cities are the entities and the locations are attributes of those entities. You can compare one city with another (entity to entity) or the location of a city to the location of another city (attribute to attribute), but you cannot compare one city to another city's location (entity to attribute). Does that make sense? Basically saying you have to compare apples to apples. Let us know if you have more questions.

Best, Jonathan
Jonathan Wylie
Kaplan Test Prep