**INTERESTING GRAPHIC DESIGNS- MIX OF AGGREGATE AT DIFFERENT LEVELS-18**

**Source: ***Understanding Quantitative History - *carenini@cs.pitt.edu

**Aggregates**: under1, 1-2.5,......,over 10, All.

COMMENT: On the argumentative choice of particular aggregation/disaggregations see also presentation (1)

**Form source (Understanding Quantitative History):
**

"Why do you think the author chose these particular population groupings? Why no more or fewer classes? why not make the population range the same in every class?

The study covers 260 towns. We speculate that Vinovsky divided the smaller
communities into several categories so as *to demonstrate* to the
reader that these categories don't make much difference - that the only
really significant difference is between the cities of 10,000 or grater
population and everywhere else. One reason it could not make the population
ranges the same for all categories is that the last category, 10,000 and
up, included Boston that had over 100,000 people in 1860."