[heavy_tail] Editorial Suggestions

[HumphreyYang]

Comments by @mbek0605:

Content

• [x] Check into yf.download and put it in its own cell block and hide-output
• [x] Update figures and images to be numbered
• [x] Overlay a normal distribution on top of the returns picture before 19.1.4
• [x] Should we use rank-size plot of qq plot? to show CCDF
• [x] See if there is a statistical test for power laws and perhaps write a seealso resource. Can you test for a pareto distribution? (Note: This has been moved to https://github.com/QuantEcon/meta/issues/141)

Comments

• [x] Further explain the intuition behind equation 19.4 work?

Comments by @SylviaZhaooo:

Content

• [x] Add a paragraph to the introduction (@SylviaZhaooo);
• [x] Overlaying the normal distribution with the heavy-tailed distribution;
• [x] Give a road map to motivate why we need to go into the details of CCDF and all the distributions.
• [x] Number graphs, give some explanation, and refer figures in text.
• [x] Be more specific when we say 'we will show ... below' by giving the section/example hyperlinks directly.