Counting Customers Who Bought Both A and B via Data Densification
There has been a calculation that is needed in market basket and correlation analysis. There is a KB article about the topic (by self-join) and I wrote a post about it before (by custom SQL).
Recently Łukasz Majewski has provided an ingenious solution using data densification. I am totally stumped.
#TweakThursday 19: ASCII as Data Marks
ASCII (and Unicode) characters can offer a variety of lightweight data marks. Judicious choices of context-sensitive data marks can create more interest in the eyes of the viewer and lead to better visualizations.
Especially in tooltips, we are limited to using ASCII/Unicode characters.
Creating Markov Chain Transition Matrix
A little question about Markov Chain came up lately. That pushed me to have a closer look at what it does. I had a vague idea about it before. This time I understand it better.
I saw a question in StackOverflow where people seems favoring a solution in SQL.
#TweakThursday 18: Aligning Up Axis
After a first-time visit to the village in Lichuan, Hubei, Central China where my grandpa was born, I am back. I gained some new perspectives on the changes in the past hundred years.
The Viz of the Day on 10/12/2016 is about the spells in Harry Potter books.
