By the way, I tried to sign up for the newsletter – since you also offered a 10% discount there, and was going to buy the book using that – but it returns with a 404 when processing via https://newsletter.datacrayon.com/subscription/form.
Sorry about the newsletter - I did not expect anything near this kind of traffic, and it's hit everything :)
I've made a temporary 15% discount coupon "hnhug10" for anyone who wants/needs one!
In the meantime I need to start thinking about more resilient hosting...
I've wanted to add Data Analysis along with ML to my utility belt. With your books and Andrew Ng's class coming up this Monday, I have a fun Winter of learning ahead of me!