lt;!-- # Review: Goals of data analysis --&gt;

&lt;!-- There are **3 main purposes** of data analysis: --&gt;
&lt;!-- 1. .hi-turquoise[**Descriptive analysis:**] Characterize observed patterns among variables. --&gt;
&lt;!-- 2. .hi[**Causal inference:**] Learn how Y changes as a result of an active intervention to change X. --&gt;
&lt;!-- 3. .hi-purple[**Prediction:**] Predict the value of one variable from other information. --&gt;

&lt;!-- Key differences among the 3 goals: --&gt;
&lt;!-- 1. **Focus:** P