Title: Recently, I&#x27;ve noticed my quantitative abilities slipping.  I want to refresh myself on probability, statistics, linear algebra, and maybe calculus?<p>Piggybacking on the thread below, I&#x27;d be curious to hear any new sites&#x2F;apps&#x2F;books&#x2F;practices the HN community recommends.  This is more of a mental exercise than an application towards a particular problem. Thanks in advance!<p>https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=3569761
Upvote: