Applying Analytics

140 Applying Analytics: A Practical Introduction

FIGURE 6.8

Histogram of the weight to height ratio of the classroom data set.

Taking the ratio of two elements measured with the Fahrenheit tempera-

ture scale is not strictly allowed, according to the rules I discussed in Section

2.2. Since 0

◦

F does not represent the absence of temperature, it is not correct

to state that one city is twice as hot as another because there is a 2:1 ratio

between their temper atures. Similarly, it should not be argued that Addis

Ababa is 1 0% cooler than Nairobi as evidenced by the ratios in Figure 6.9 be-

ing centered near 0.9 – instead, the figur e illustrates simply