

- Is a 1-unit error (*e.g.*, $1,000) equally bad for everyone?

- Is an overestimate equally bad as an underestimate?

&lt;!-- --- --&gt;
&lt;!-- ## Subtlety --&gt;

&lt;!-- Defining performance can be tricky... --&gt;

&lt;!-- *Classification:* --&gt;

&lt;!-- - Which is worse? --&gt;
&lt;!--   1. False positive (*e.g.*, incorrectly diagnosing cancer) --&gt;
&lt;!--   1. False negative (*e.g.*, missing cancer) --&gt;

&lt;!-- - Which is more important? --&gt;
&lt;!--   1. True positive (*e.g.*, correct d