This is a very good point, I totally agree!<p>Although for some questions, e.g. &quot;Can you escape poverty in the US today?&quot; (which could be specified as moving from 1st -&gt; 3rd quartile) this data works.<p>But, for other types of questions, e.g. &quot;Is extreme wealth mostly hereditary?&quot; you&#x27;d need a non-linear breakdown of classes.