Synopsis: Explains statistical concepts like k-means clustering and linear regression, while showing how to implement them in Excel.
Difficulty: Beginner, but experience using Excel is a must.
I first became aware of John W. Foreman when MailChimp, a local marketing software firm, hired him. I had used MailChimp extensively on a previous blog so the announcement caught my eye. Later, when I saw that he had published a book about data, my curiosity was aroused.